Zikmund, William G., author
Salemba Empat, 2013
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Malhotra, Naresh K., author
Indeks, 2006
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Rangkuti, Freddy, author
Gramedia Pustaka Utama, 1997
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Malhotra, Naresh K, author
Indeks, 2006
Buku Teks
Rangkuti, Freddy, author
Gramedia Pustaka Utama, 1997
Buku Teks