7 Things You May Not Know About 'The Jungle' | History.com
How Upton Sinclair’s 'The Jungle' Unintentionally Spurred Food Safety Laws | WTTW
The Jungle and the Community: Workers and Reformers in Turn-of-the-Century Chicago | The Newberry
Upton Sinclair, The Jungle, 1906 | Bill of Rights Institute
Upton Sinclair's The Jungle: Muckraking the Meat-Packing Industry | Constitutional Rights Foundation