Crisp, Richard D., author
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Buku Teks
Aaker, David A., author
John Wiley & Sons, 2000
Buku Teks
Istijanto, author
Gramedia Pustaka Utama, 2005
Buku Teks
Zikmund, William G., author
Salemba Empat, 2013
Buku Teks
Aaker, David A., author
John Wiley & Sons, 1995
Buku Teks