Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

Lipsey, Richard G., i K. Alec Chrystal. Principles of Economics. 9th.ed. Oxford: Oxford Univ., 1999.

Cita MLA (9th ed.)

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