Oliver, R. (1975). Africa in the iron age. Cambridge University Press.
Lua i Stíl Chicago (17ú heag.)Oliver, Ronald. Africa in the Iron Age. New York: Cambridge University Press, 1975.
Lua MLA (9ú heag.)Oliver, Ronald. Africa in the Iron Age. Cambridge University Press, 1975.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.