Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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