Gregory, P. R. (2005). Essentials of economics. Boston, MA: Pearson Education.
Čikaški stil citiranjaGregory, Paul R. Essentials of Economics. Boston, MA: Pearson Education, 2005.
MLA način citiranjaGregory, Paul R. Essentials of Economics. Boston, MA: Pearson Education, 2005.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.