Cita APA (7th ed.)

Lipsey, R. G. (1975). An introduction to positive economics. ELBS, Weidenfeld and Nicolson.

Cita Chicago (17th ed.)

Lipsey, Richard G. An Introduction to Positive Economics. London: ELBS, Weidenfeld and Nicolson, 1975.

Cita MLA (9th ed.)

Lipsey, Richard G. An Introduction to Positive Economics. ELBS, Weidenfeld and Nicolson, 1975.