APA (7th ed.) Citation

Lipsey, R. G. (1999). Principles of economics (9th ed.). Univ. Pr.

Chicago Style (17th ed.) Citation

Lipsey, Richard G. Principles of Economics. 9th ed. Oxford: Univ. Pr, 1999.

MLA (9th ed.) Citation

Lipsey, Richard G. Principles of Economics. 9th ed. Univ. Pr, 1999.