Bhratara Karya Aksara, 1978
Buku Teks
Yudin, Daniel L
Gramedia Pustaka Utama, 1999
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Aaker, David A., author
John Wiley & Sons, 1984
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FEUI - Management Research Center (MRC), {s.a}
Majalah, Jurnal, Buletin
N.Y. Honaver House , 1955
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