Cita APA (7a ed.)

Hertwig, R., & Kingsley, J. S. (1902). A manual of zoology. H. Holt and Co..

Cita Chicago Style (17a ed.)

Hertwig, Richard, y J. S. Kingsley. A Manual of Zoology. New York: H. Holt and Co., 1902.

Cita MLA (8a ed.)

Hertwig, Richard, y J. S. Kingsley. A Manual of Zoology. H. Holt and Co., 1902.