APA (7th ed.) Citation

Hardin, G. J. (1968). 39 steps to biology: Readings from Scientific American. W. H. Freeman.

Chicago Style (17th ed.) Citation

Hardin, Garrett James. 39 Steps to Biology: Readings from Scientific American. San Francisco: W. H. Freeman, 1968.

MLA (9th ed.) Citation

Hardin, Garrett James. 39 Steps to Biology: Readings from Scientific American. W. H. Freeman, 1968.