APA (7e ed.) Bronvermelding

Koopmans, T. C. (1957). Three essays on the state of economic science (Paperback edition.). McGraw-Hill.

Chicago (17e ed.) Bronvermelding

Koopmans, Tjalling C. Three Essays on the State of Economic Science. Paperback edition. New York: McGraw-Hill, 1957.

MLA (8e ed.) Bronvermelding

Koopmans, Tjalling C. Three Essays on the State of Economic Science. Paperback edition. McGraw-Hill, 1957.