Cita APA (7a ed.)

Sumner, J. B., & Somers, G. F. (1945). Chemistry and methods of enzymes (2nd printing.). Academic Press.

Cita Chicago Style (17a ed.)

Sumner, James Batcheller, y George Fred Somers. Chemistry and Methods of Enzymes. 2nd printing. New York: Academic Press, 1945.

Cita MLA (9a ed.)

Sumner, James Batcheller, y George Fred Somers. Chemistry and Methods of Enzymes. 2nd printing. Academic Press, 1945.