“Interesting Statistics of the Colored Race”, Arizona sentinel and Yuma weekly examiner (Yuma, Arizona, USA), Thursday, 9 May 1912, page 2, column 3.
Läst 10 februari 2013. ^ “Interesting Statistics of the Colored Race” (på engelska) , Arizona sentinel and Yuma weekly examiner (Yuma, Arizona, USA), torsdag, 9 maj 1912, s. 2, kol.WikiMatrix WikiMatrix