Παραπομπή APA

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

Παραπομπή Chicago Style

Lipsey, Richard G., και K. Alec Chrystal. Principles of Economics. 9th. Oxford: Oxford University, 1999.

Παραπομπή MLA

Lipsey, Richard G., και K. Alec Chrystal. Principles of Economics. 9th. Oxford University, 1999.