Lua APA (7ú heag.)

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

Lua i Stíl Chicago (17ú heag.)

Lipsey, Richard G., agus K. Alec Chrystal. Principles of Economics. 9th ed. Oxford ; New York: Oxford University Press, 1999.

Lua MLA (8ú heag.)

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

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