Cita APA

Engemann, J. G., & Hegner, R. W. (1981). Invertebrate zoology (3rd ed.). Collier Macmillan Publishers.

Citación estilo Chicago

Engemann, Joseph G., and Robert William Hegner. Invertebrate Zoology. 3rd ed. New York: Collier Macmillan Publishers, 1981.

Cita MLA

Engemann, Joseph G., and Robert William Hegner. Invertebrate Zoology. 3rd ed. Collier Macmillan Publishers, 1981.