APA-referens

Koopmans, T. C. (1957). Three essays on the state of eocnomic science. McGraw Hill.

Chicago-stil citat

Koopmans, Tjalling C. Three Essays on the State of Eocnomic Science. New York: McGraw Hill, 1957.

MLA-referens

Koopmans, Tjalling C. Three Essays on the State of Eocnomic Science. McGraw Hill, 1957.