APA (7th ed.) Citation

Sumner, J. B., & Somers, G. F. (1943). Chemistry and methods of enzymes. Academic Press.

Chicago Style (17th ed.) Citation

Sumner, James Batcheller, and George Frederick Somers. Chemistry and Methods of Enzymes. New York, N.Y.: Academic Press, 1943.

MLA (9th ed.) Citation

Sumner, James Batcheller, and George Frederick Somers. Chemistry and Methods of Enzymes. Academic Press, 1943.