APA (7th ed.) Citation

Mayr, E., & Usinger, R. L. (1953). Methods and principles of systematic zoology. McGraw-Hill Book Co., Inc.

Chicago Style (17th ed.) Citation

Mayr, Ernst, and Robert L. Usinger. Methods and Principles of Systematic Zoology. New York: McGraw-Hill Book Co., Inc, 1953.

MLA (9th ed.) Citation

Mayr, Ernst, and Robert L. Usinger. Methods and Principles of Systematic Zoology. McGraw-Hill Book Co., Inc, 1953.