Gaya APA

Wooldridge, J, M. (2006). Introductory Econometrics: A Modern Approach (Ed. 4). USA: South-Western Cengage Learning.

Gaya MLA

Wooldridge, Jeffrey, M.. "Introductory Econometrics: A Modern Approach". Ed. 4 USA: South-Western Cengage Learning, 2006. Text.