Cita APA (7a ed.)

Lipsey, R. G. (1990). An introduction to positive economics (7th ed., repr.). George Weindenfeld and Nicolson.

Cita Chicago Style (17a ed.)

Lipsey, Richard G. An Introduction to Positive Economics. 7th ed., repr. London: George Weindenfeld and Nicolson, 1990.

Cita MLA (8a ed.)

Lipsey, Richard G. An Introduction to Positive Economics. 7th ed., repr. George Weindenfeld and Nicolson, 1990.