APA (7th ed.) Citation

Post, K. (1968). The new states of West Africa (Rev. ed.). Penguin.

Chicago Style (17th ed.) Citation

Post, Ken. The New States of West Africa. Rev. ed. Harmondsworth: Penguin, 1968.

MLA (9th ed.) Citation

Post, Ken. The New States of West Africa. Rev. ed. Penguin, 1968.