Lua APA (7ú heag.)

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

Lua i Stíl Chicago (17ú heag.)

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

Lua MLA (8ú heag.)

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

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