Cita APA (7a ed.)

Sumner, J. B., & Somers, G. F. (1947). Chemistry and methods of enzymes (2nd ed., rev. and enl.). Academic Press.

Cita Chicago Style (17a ed.)

Sumner, James B., y G. Fred Somers. Chemistry and Methods of Enzymes. 2nd ed., rev. and enl. New York, N.Y.: Academic Press, 1947.

Cita MLA (8a ed.)

Sumner, James B., y G. Fred Somers. Chemistry and Methods of Enzymes. 2nd ed., rev. and enl. Academic Press, 1947.