Wills, A. J. (1967). An introduction to the history of Central Africa (2nd ed.). Oxford U.P.
Lua i Stíl Chicago (17ú heag.)Wills, A. J. An Introduction to the History of Central Africa. 2nd ed. London: Oxford U.P, 1967.
Lua MLA (9ú heag.)Wills, A. J. An Introduction to the History of Central Africa. 2nd ed. Oxford U.P, 1967.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.