Stefan Goodwin, Africas Legacies Of Urbanization (2006), p. 191, https://books.google.com/books?isbn=0739133489:"...and further west the even more numerous Sara [western Central African Republic, southern Chad, and northern Cameroon."
Peoples of Africa: Burkina Faso-Comoros - Volume 2 (2001), p. 86, https://books.google.com/books?isbn=076147160X:"The Central African Republic is a land of many different peoples... The Sara (SAHR) live in the grain-growing lands of the north as well as across the border in Chad."
Zangato, É.; Holl, A. F. C. (2010). «On the Iron Front: New Evidence from North-Central Africa». Journal of African Archaeology8 (1): 7–23. doi:10.3213/1612-1651-10153.