APA استشهاد

Northrop, J., & ...[et al.]. (1939). Crystalline enzymes/2nd ed (2nd ed.). Columbia unicersity.

استشهاد بنمط شيكاغو

Northrop, John, و ...[et al.]. Crystalline Enzymes/2nd Ed. 2nd ed. New york: Columbia unicersity, 1939.

MLA استشهاد

Northrop, John, و ...[et al.]. Crystalline Enzymes/2nd Ed. 2nd ed. Columbia unicersity, 1939.