Cita APA (7th ed.)

Mayr, E. (1969). Principles of systematic zoology. McGraw-Hill.

Cita Chicago (17th ed.)

Mayr, Ernst. Principles of Systematic Zoology. New York: McGraw-Hill, 1969.

Cita MLA (9th ed.)

Mayr, Ernst. Principles of Systematic Zoology. McGraw-Hill, 1969.