APA Citatie

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

Chicago Style citaat

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

MLA citatie

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