"A very prominent racial dividing line between African Caucasian and Negroid groups runs west to east, south of the Sahara Desert into Sudan before curving southward toward the Kenyan-Somali border." Stephen Emerson, Hussein Solomon, African security in the twenty-first century: Challenges and opportunities, Oxford University Press (2018), p. 41.
physanth.org
American Association of Physical Anthropologists (27 March 2019). "AAPA Statement on Race and Racism". American Association of Physical Anthropologists. Retrieved 19 June 2020.
