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Buku Teks
Hawkins, Del I., author
McGraw-Hill, Irwin, 2007
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Dhitami Astialinda, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2015
UI - Skripsi (Membership)
Schiffman, Leon G., author
Prentice-Hall, 1991
Buku Teks
Schiffman, Leon G., author
Prentice-Hall, 1991
Buku Teks