diff --git a/src/file/document/body/body.ts b/src/file/document/body/body.ts
index 691dfd7518..138a629409 100644
--- a/src/file/document/body/body.ts
+++ b/src/file/document/body/body.ts
@@ -1,6 +1,6 @@
-import { XmlComponent, IXmlableObject } from "file/xml-components";
-import { SectionProperties, SectionPropertiesOptions } from "./section-properties/section-properties";
+import { IXmlableObject, XmlComponent } from "file/xml-components";
 import { Paragraph, ParagraphProperties } from "../..";
+import { SectionProperties, SectionPropertiesOptions } from "./section-properties/section-properties";
 
 export class Body extends XmlComponent {
     private defaultSection: SectionProperties;
@@ -22,7 +22,7 @@ export class Body extends XmlComponent {
      *  - last section should be direct child of body
      * @param section new section
      */
-    addSection(section: SectionPropertiesOptions | SectionProperties) {
+    public addSection(section: SectionPropertiesOptions | SectionProperties): void {
         const currentSection = this.sections.pop() as SectionProperties;
         this.root.push(this.createSectionParagraph(currentSection));
         if (section instanceof SectionProperties) {
@@ -45,11 +45,11 @@ export class Body extends XmlComponent {
         this.root.push(component);
     }
 
-    get DefaultSection() {
+    get DefaultSection(): SectionProperties {
         return this.defaultSection;
     }
 
-    private createSectionParagraph(section: SectionProperties) {
+    private createSectionParagraph(section: SectionProperties): Paragraph {
         const paragraph = new Paragraph();
         const properties = new ParagraphProperties();
         properties.addChildElement(section);
diff --git a/src/file/document/body/section-properties/footer-reference/footer-reference.ts b/src/file/document/body/section-properties/footer-reference/footer-reference.ts
index 3805676841..6c2786432d 100644
--- a/src/file/document/body/section-properties/footer-reference/footer-reference.ts
+++ b/src/file/document/body/section-properties/footer-reference/footer-reference.ts
@@ -1,13 +1,13 @@
 import { XmlComponent } from "file/xml-components";
 import { FooterReferenceAttributes, FooterReferenceType } from "./footer-reference-attributes";
 
-export interface FooterOptions {
+export interface IFooterOptions {
     footerType?: FooterReferenceType;
     footerId?: number;
 }
 
 export class FooterReference extends XmlComponent {
-    constructor(options: FooterOptions) {
+    constructor(options: IFooterOptions) {
         super("w:footerReference");
 
         this.root.push(
diff --git a/src/file/document/body/section-properties/header-reference/header-reference.ts b/src/file/document/body/section-properties/header-reference/header-reference.ts
index 4065ed5253..8464a33a92 100644
--- a/src/file/document/body/section-properties/header-reference/header-reference.ts
+++ b/src/file/document/body/section-properties/header-reference/header-reference.ts
@@ -1,13 +1,13 @@
 import { XmlComponent } from "file/xml-components";
 import { HeaderReferenceAttributes, HeaderReferenceType } from "./header-reference-attributes";
 
-export interface HeaderOptions {
+export interface IHeaderOptions {
     headerType?: HeaderReferenceType;
     headerId?: number;
 }
 
 export class HeaderReference extends XmlComponent {
-    constructor(options: HeaderOptions) {
+    constructor(options: IHeaderOptions) {
         super("w:headerReference");
         this.root.push(
             new HeaderReferenceAttributes({
diff --git a/src/file/document/body/section-properties/page-size/page-size.ts b/src/file/document/body/section-properties/page-size/page-size.ts
index bf5499d3f1..6aa400bea2 100644
--- a/src/file/document/body/section-properties/page-size/page-size.ts
+++ b/src/file/document/body/section-properties/page-size/page-size.ts
@@ -1,5 +1,5 @@
 import { XmlComponent } from "file/xml-components";
-import { PageSizeAttributes, PageOrientation } from "./page-size-attributes";
+import { PageOrientation, PageSizeAttributes } from "./page-size-attributes";
 
 export class PageSize extends XmlComponent {
     constructor(width: number, height: number, orientation: PageOrientation) {
diff --git a/src/file/document/body/section-properties/section-properties.ts b/src/file/document/body/section-properties/section-properties.ts
index 557d33acb4..f448a1a2cf 100644
--- a/src/file/document/body/section-properties/section-properties.ts
+++ b/src/file/document/body/section-properties/section-properties.ts
@@ -5,8 +5,8 @@ import { Columns } from "./columns/columns";
 import { IColumnsAttributes } from "./columns/columns-attributes";
 import { DocumentGrid } from "./doc-grid/doc-grid";
 import { IDocGridAttributesProperties } from "./doc-grid/doc-grid-attributes";
-import { FooterOptions, FooterReference } from "./footer-reference/footer-reference";
-import { HeaderOptions, HeaderReference } from "./header-reference/header-reference";
+import { FooterReference, IFooterOptions } from "./footer-reference/footer-reference";
+import { HeaderReference, IHeaderOptions } from "./header-reference/header-reference";
 import { HeaderReferenceType } from "./header-reference/header-reference-attributes";
 import { PageMargin } from "./page-margin/page-margin";
 import { IPageMarginAttributes } from "./page-margin/page-margin-attributes";
@@ -18,8 +18,8 @@ export type SectionPropertiesOptions = IPageSizeAttributes &
     IPageMarginAttributes &
     IColumnsAttributes &
     IDocGridAttributesProperties &
-    HeaderOptions &
-    FooterOptions &
+    IHeaderOptions &
+    IFooterOptions &
     IPageNumberTypeAttributes;
 
 export class SectionProperties extends XmlComponent {
diff --git a/src/file/document/document.ts b/src/file/document/document.ts
index 5e0d3276e7..d8db84adf3 100644
--- a/src/file/document/document.ts
+++ b/src/file/document/document.ts
@@ -71,7 +71,7 @@ export class Document extends XmlComponent {
         return run;
     }
 
-    get Body() {
+    get Body(): Body {
         return this.body;
     }
 }
diff --git a/src/file/footer/footer.ts b/src/file/footer/footer.ts
index 34ee22a43e..cbdd4a544d 100644
--- a/src/file/footer/footer.ts
+++ b/src/file/footer/footer.ts
@@ -32,7 +32,7 @@ export class Footer extends XmlComponent {
         );
     }
 
-    get referenceId() {
+    public get referenceId(): number {
         return this.refId;
     }
 
diff --git a/src/file/header/header.ts b/src/file/header/header.ts
index f1a9f566c4..b0ffaa8a63 100644
--- a/src/file/header/header.ts
+++ b/src/file/header/header.ts
@@ -32,7 +32,7 @@ export class Header extends XmlComponent {
         );
     }
 
-    get referenceId() {
+    get referenceId(): number {
         return this.refId;
     }