Citazione Stile APA (7a Edizione)

Gregory, P. R., & Stuart, R. C. (2004). Comparing economic systems in the twenty-first century (7th ed.). Houghton Mifflin Company.

Citazione stile Chigago Style (17a edizione)

Gregory, Paul R., e Robert C. Stuart. Comparing Economic Systems in the Twenty-first Century. 7th ed. Boston: Houghton Mifflin Company, 2004.

Citatione MLA (9a ed.)

Gregory, Paul R., e Robert C. Stuart. Comparing Economic Systems in the Twenty-first Century. 7th ed. Houghton Mifflin Company, 2004.