Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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