Cita APA (7th ed.)
Lipsey, R. G., & Courant, P. N. (1983). An introduction to positive economics (7th ed.). Weidenfield & NicholsonLtd..
Cita Chicago (17th ed.)
Lipsey, Richard G., i Paul N. Courant. An Introduction to Positive Economics. 7th ed. London: Weidenfield & NicholsonLtd., 1983.
Cita MLA (9th ed.)
Lipsey, Richard G., i Paul N. Courant. An Introduction to Positive Economics. 7th ed. Weidenfield & NicholsonLtd., 1983.
Atenció: Aquestes cites poden no estar 100% correctes.