Mcguire, George (1921). Universal Negro catechism: a course of instruction in religious and historical knowledge pertaining to the race. New York: Universal Negro Improvement Association. p. 34. hdl:2027/emu.010000685445.
"History – Red – Black – Green". The Official Website of the United Negro Improvement Association and the African Communities League. Archived from the original on 27 August 2018. Retrieved 13 November 2019.
"History – Red – Black – Green". The Official Website of the United Negro Improvement Association and the African Communities League. Archived from the original on 27 August 2018. Retrieved 13 November 2019.