Cita APA (7th ed.)

Lipsey, R. G. (1966). An introduction positive economics (2a. ed.). Weidenfeld and Nicholson.

Cita Chicago (17th ed.)

Lipsey, Richard G. An Introduction Positive Economics. 2a. ed. Londres: Weidenfeld and Nicholson, 1966.

Cita MLA (9th ed.)

Lipsey, Richard G. An Introduction Positive Economics. 2a. ed. Weidenfeld and Nicholson, 1966.