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.
Atenció: Aquestes cites poden no estar 100% correctes.