APA (7th ed.) Citation

Roberts, A. (1949). The birds of South Africa (7th imp.). Witherby.

Chicago Style (17th ed.) Citation

Roberts, Austin. The Birds of South Africa. 7th imp. London [u.a.]: Witherby, 1949.

MLA (9th ed.) Citation

Roberts, Austin. The Birds of South Africa. 7th imp. Witherby, 1949.