Cita APA (7a ed.)

Lipsey, R. G. (1979). An introduction to positive economics (5th ed.). Weidenfeld and Nicolson.

Cita Chicago Style (17a ed.)

Lipsey, Richard G. An Introduction to Positive Economics. 5th ed. London: Weidenfeld and Nicolson, 1979.

Cita MLA (8a ed.)

Lipsey, Richard G. An Introduction to Positive Economics. 5th ed. Weidenfeld and Nicolson, 1979.