Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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