NAACP History and Geography. Mapping American Social Movements Through the 20th Century. University of Washington. [April 13, 2017]. (原始内容存档于May 10, 2017).
NAACP History and Geography. Mapping American Social Movements Through the 20th Century. University of Washington. [April 13, 2017]. (原始内容存档于May 10, 2017).