APA (7th ed.) Citation

Gregor, A. S. (1967). Charles Darwin. Angus & Robertson.

Chicago Style (17th ed.) Citation

Gregor, Arthur S. Charles Darwin. London: Angus & Robertson, 1967.

MLA (9th ed.) Citation

Gregor, Arthur S. Charles Darwin. Angus & Robertson, 1967.

Warning: These citations may not always be 100% accurate.