Gaya APA

SALVATORE, D., Diulio, E, A. (2003). Principles of economics Schaum's easy outlines . new york: Mc Graw Hill.

Gaya MLA

SALVATORE, Dominick., Diulio, Eugene, A.. "Principles of economics Schaum's easy outlines". new york: Mc Graw Hill, 2003. Fakultas Bisnis.