APA استشهاد

Mankiw,Gregory N. (2019). Principles of economics (7th.). Cengage.

استشهاد بنمط شيكاغو

Mankiw,Gregory N. Principles of Economics. 7th. ND: Cengage, 2019.

MLA استشهاد

Mankiw,Gregory N. Principles of Economics. 7th. Cengage, 2019.