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De Knipscher, 2000
Buku Teks
Scales, Pat R., author
[American Management Association, ], 2009
eBooks
Jones, Barbara M., author
[American Management Association, ], 2009
eBooks
Manalu, Abby Gina Boang, author
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2012
UI - Skripsi (Open)
Haas, Ernst B.
Standford University Press, 1970
Buku Teks