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Buku Teks
Packard, Philip C., author
Mouton, 1972
Buku Teks
Lockyer, Keith, author
Prentice-Hall, 2005
Buku Teks
Iqbal Firmansyah, author
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UI - Tesis (Membership)
Rissa Delania, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2015
UI - Tesis (Membership)