APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

Engemann, Joseph G., and Robert W. Hegner. Invertebrate Zoology. 3rd ed. Macmillan, 1981.