Survey keputusan membeli
Artikel Jurnal
Cooper, Joseph D., author
The art of decision making
Doubleday, 1961
Buku Teks
Asian Survey
California : The Institute of International Studies, University of California, 1993
Majalah, Jurnal, Buletin
Survey sampling
Buku Teks
Kish, Leslie, author
Survey sampling
John Wiley & Sons, 1965
Buku Teks
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