APA (7th ed.) Citation

Mayr, E., & Ashlock, P. D. (1991). Principles of systematic zoology (2. ed.). McGraw-Hill.

Chicago Style (17th ed.) Citation

Mayr, Ernst, and Peter D. Ashlock. Principles of Systematic Zoology. 2. ed. New York u.a: McGraw-Hill, 1991.

MLA (9th ed.) Citation

Mayr, Ernst, and Peter D. Ashlock. Principles of Systematic Zoology. 2. ed. McGraw-Hill, 1991.