APA (7th ed.) Citation

Behnke, J. A. (1972). Challenging biological problems: Directions toward their solution. Oxford University Press.

Chicago Style (17th ed.) Citation

Behnke, John A. Challenging Biological Problems: Directions Toward Their Solution. New York: Oxford University Press, 1972.

MLA (9th ed.) Citation

Behnke, John A. Challenging Biological Problems: Directions Toward Their Solution. Oxford University Press, 1972.