Cita APA

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

Citación estilo Chicago

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

Cita MLA

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