Cita APA (7a ed.)

Hegner, R. W., & Engemann, J. G. (1968). Invertebrate zoology. Macmillan.

Cita Chicago Style (17a ed.)

Hegner, Robert William, y Joseph G. Engemann. Invertebrate Zoology. New York: Macmillan, 1968.

Cita MLA (9a ed.)

Hegner, Robert William, y Joseph G. Engemann. Invertebrate Zoology. Macmillan, 1968.