APA

(2003). Principles of Economics: Crash Course. New York, USA: McGraw-Hill ،.

Chicago

2003. Principles of Economics: Crash Course. New York, USA: McGraw-Hill ،.

Harvard

(2003). Principles of Economics: Crash Course. New York, USA: McGraw-Hill ،.

MLA

Principles of Economics: Crash Course. New York, USA: McGraw-Hill ،. 2003.