A wide variety of sources were used to create this timeline. From the Bentley Historical Library the following collections were used:

Dan Bessie
Sandra S. Cole
Billie Louise Edwards
Ruth Ellis
Growing Up Gay publication
Douglas M. Haller
John L. Kavanaugh
Lavendar Information and Library Association
Office of Lesbian Gay Bisexual and Transgender Affairs
President (University of Michigan)
Jim Toy
Daniel Tsang

From the internet, these sources were used:

This subject guide was created by School of Information graduate student JJ Pionke MSI '13.