APA (7th ed.) Citation

Lipsey, R. G. (1971). An introduction to positive economics (3rd ed.). Weidenfeld and Nicolson.

Chicago Style (17th ed.) Citation

Lipsey, Richard G. An Introduction to Positive Economics. 3rd ed. London: Weidenfeld and Nicolson, 1971.

MLA (9th ed.) Citation

Lipsey, Richard G. An Introduction to Positive Economics. 3rd ed. Weidenfeld and Nicolson, 1971.