Cita APA (7a ed.)

Hegner, R. W., & Engemann, J. G. (1968). Invertebrate zoology (2nd ed.). MacMillan.

Cita Chicago Style (17a ed.)

Hegner, Robert W., y Joseph G. Engemann. Invertebrate Zoology. 2nd ed. New York: MacMillan, 1968.

Cita MLA (8a ed.)

Hegner, Robert W., y Joseph G. Engemann. Invertebrate Zoology. 2nd ed. MacMillan, 1968.