Uma Sekaran, 1992, Research Methods for Business: A Skill Building Approach, 2th Edition, John Wiley & Son, i9nc. New York, USA.
FN. Kerlinger, 1998, Azas-Azas Penelitian Behavioral, 3th edition, Gadjah Mada University Press, Yogyakarta.
Modul Metodologi Penelitian, 2002,.
lebih jelasnya bisa dilanjut pada power point dilink ini :http://downloads.ziddu.com/download/25011774/metode_penelitian.ppt.html
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