APA (7th ed.) Citation

Blackwelder, R. E. (1963). Classification of the animal kingdom. Southern Illinois University Press.

Chicago Style (17th ed.) Citation

Blackwelder, Richard E. Classification of the Animal Kingdom. Carbondale, Ill: Southern Illinois University Press, 1963.

MLA (9th ed.) Citation

Blackwelder, Richard E. Classification of the Animal Kingdom. Southern Illinois University Press, 1963.