APA (7th ed.) Zitazioa

Lipsey, R. G. (1989). An introduction to positive economics (7th ed.). ELBS/ Weidenfeld & Nicholson.

Chicago Style (17th ed.) Zitazioa

Lipsey, Richard G. An Introduction to Positive Economics. 7th ed. London: ELBS/ Weidenfeld & Nicholson, 1989.

MLA (9th ed.) Zitazioa

Lipsey, Richard G. An Introduction to Positive Economics. 7th ed. ELBS/ Weidenfeld & Nicholson, 1989.