APA (7th ed.) Citation

Buchsbaum, R. M. (1944). Animals without backbones: An introd.to the invertebrates (7. impr.). Univ.pr.

Chicago Style (17th ed.) Citation

Buchsbaum, Ralph Morris. Animals Without Backbones: An Introd.to the Invertebrates. 7. impr. Chicago: Univ.pr, 1944.

MLA (9th ed.) Citation

Buchsbaum, Ralph Morris. Animals Without Backbones: An Introd.to the Invertebrates. 7. impr. Univ.pr, 1944.