APA aipamena

Gregory, P. R. (2005). Essentials of economics. Boston, MA: Pearson Education.

Chicago Style aipamena

Gregory, Paul R. Essentials of Economics. Boston, MA: Pearson Education, 2005.

MLA aipamena

Gregory, Paul R. Essentials of Economics. Boston, MA: Pearson Education, 2005.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.