APA

Sumner J. B., Somers G. F., . (1947). Chemistry and methods of enzymes. New York, N.Y: Academic Press.

Chicago

Sumner James B, Somers G Fred, . 1947. Chemistry and methods of enzymes. New York, N.Y: Academic Press.

Harvard

Sumner J. B., Somers G. F., . (1947). Chemistry and methods of enzymes. New York, N.Y: Academic Press.

MLA

Sumner James B, Somers G Fred, . Chemistry and methods of enzymes. New York, N.Y: Academic Press. 1947.