APA (7th ed.) Citation

Roberts, A. (1951). The Birds of South Africa ((8. impr.).). Witherby [u.a.].

Chicago Style (17th ed.) Citation

Roberts, Austin. The Birds of South Africa. (8. impr.). London [u.a.]: Witherby [u.a.], 1951.

MLA (9th ed.) Citation

Roberts, Austin. The Birds of South Africa. (8. impr.). Witherby [u.a.], 1951.