Gaya APA

Achmadi, U, F. (2004). Research Methodology : Methods and teqniques (second revised edition) (Ed. 2). Jena :: New Age International.

Gaya MLA

Achmadi, Umar, Fahmi. "Research Methodology : Methods and teqniques (second revised edition)". Ed. 2 Jena :: New Age International, 2004. Text.