APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Hegner, Robert William, and Joseph G. Engemann. Invertebrate Zoology. 2nd ed. New York: Macmillan, 1968.

MLA (9th ed.) Citation

Hegner, Robert William, and Joseph G. Engemann. Invertebrate Zoology. 2nd ed. Macmillan, 1968.