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UI - Skripsi (Membership)
Charles E. Tutle Company, 1978
Buku Teks
Wilcocks, Julie, author
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Buku Referensi
Symmons, Clive R., author
Martinus Nijhoff, 1979
Buku Teks
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FEUI - Management Research Center (MRC), 2017
Artikel Jurnal