APA (7th ed.) Citation

Endler, J. A. (1977). Geographic variation, speciation and clines. Princeton.

Chicago Style (17th ed.) Citation

Endler, John A. Geographic Variation, Speciation and Clines. Princeton: Princeton, 1977.

MLA (8th ed.) Citation

Endler, John A. Geographic Variation, Speciation and Clines. Princeton, 1977.

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