APA (7th ed.) Citation

Lipsey, R., & Chrystal, K. A. (1999). Principles of economics (9th ed.). Oxford Univ. Press.

Chicago Style (17th ed.) Citation

Lipsey, Richard, and K. Alec Chrystal. Principles of Economics. 9th ed. Oxford [u.a.]: Oxford Univ. Press, 1999.

MLA (9th ed.) Citation

Lipsey, Richard, and K. Alec Chrystal. Principles of Economics. 9th ed. Oxford Univ. Press, 1999.