Citazione Stile APA (7a Edizione)

Gregory, P. R. (2002). Essentials of economics (5th ed.). Addison Wesley.

Citazione stile Chigago Style (17a edizione)

Gregory, Paul R. Essentials of Economics. 5th ed. Boston, Mass: Addison Wesley, 2002.

Citatione MLA (9a ed.)

Gregory, Paul R. Essentials of Economics. 5th ed. Addison Wesley, 2002.