APA (7th ed.) Citation

Northrop, J. H., Kunitz, M., & Herriot, R. M. (1948). Crystalline enzymes (2nd ed., rev. and enl.). Columbia University Press.

Chicago Style (17th ed.) Citation

Northrop, John Howard, Moses Kunitz, and Roger Moss Herriot. Crystalline Enzymes. 2nd ed., rev. and enl. New York: Columbia University Press, 1948.

MLA (8th ed.) Citation

Northrop, John Howard, et al. Crystalline Enzymes. 2nd ed., rev. and enl. Columbia University Press, 1948.