Cita APA (7th ed.)

Lipsey, R. G. (1995). An Introduction to positive economics (8th ed.). Univ. Pr.

Cita Chicago (17th ed.)

Lipsey, Richard G. An Introduction to Positive Economics. 8th ed. Oxford: Univ. Pr, 1995.

Cita MLA (9th ed.)

Lipsey, Richard G. An Introduction to Positive Economics. 8th ed. Univ. Pr, 1995.