APA (7th ed.) Citation

Sumner, J. B., & Somers, G. F. (1947). Chemistry and methods of enzymes. Academic Press.

Chicago Style (17th ed.) Citation

Sumner, J B., and G. Fred Somers. Chemistry and Methods of Enzymes. New York: Academic Press, 1947.

MLA (9th ed.) Citation

Sumner, J B., and G. Fred Somers. Chemistry and Methods of Enzymes. Academic Press, 1947.