APA (7th ed.) Citation

Buchsbaum, R. M. Animals without backbones: An introduction to the invertebrates. Penguin Books.

Chicago Style (17th ed.) Citation

Buchsbaum, Ralph Morris. Animals Without Backbones: An Introduction to the Invertebrates. Harmondsworth [u.a.]: Penguin Books.

MLA (9th ed.) Citation

Buchsbaum, Ralph Morris. Animals Without Backbones: An Introduction to the Invertebrates. Penguin Books.

Warning: These citations may not always be 100% accurate.