[1] Oklahoma City, Oklahoma. July 1939.
Russell Lee, Photographer."Man drinking at a water cooler in the street car terminal." [Sign: "Reserved for Colored"] Location: H-90666
Reproduction Number: LC-USZ62-80126
Credit Line: Library of Congress, Prints & Photographs Division, FSA/OWI Collection, [reproduction number, e.g., LC-USF34-9058-C]

[2] Polaris (n.d.). Oklahoma National Human Trafficking Hotline.

[3 Allen, J. (2019, June 30). Oklahoma ranks 28th in active human trafficking cases in Federal Court. report shows. The Oklahoman.