APA (7th ed.) Citation

Locy, W. A. (1918). The main currents of zoology. Henry Holt.

Chicago Style (17th ed.) Citation

Locy, William A. The Main Currents of Zoology. New York: Henry Holt, 1918.

MLA (9th ed.) Citation

Locy, William A. The Main Currents of Zoology. Henry Holt, 1918.