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Broussard 2006. Albert S. Broussard (2006). "Percy H. Steele, Jr., and the Urban League: Race Relations and the Struggle for Civil Rights in Post-World War II San Diego". California History. 83 (4): 7–23. doi:10.2307/25161838. JSTOR25161838.
Jordan Ervin (2008–2009). "San Diego's Urban Trophy: Horton Plaza Redevelopment Project". Southern California Quarterly. 90 (4): 419–453. doi:10.2307/41172445. JSTOR41172445.
Broussard 2006. Albert S. Broussard (2006). "Percy H. Steele, Jr., and the Urban League: Race Relations and the Struggle for Civil Rights in Post-World War II San Diego". California History. 83 (4): 7–23. doi:10.2307/25161838. JSTOR25161838.
Jordan Ervin (2008–2009). "San Diego's Urban Trophy: Horton Plaza Redevelopment Project". Southern California Quarterly. 90 (4): 419–453. doi:10.2307/41172445. JSTOR41172445.