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Silverman, George, author
American Management Association, 2001
eBooks
Peranginangin, Gerha Jayamala, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2017
UI - Tesis (Membership)
Naiborhu, Melissa B.V., author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2013
UI - Skripsi (Membership)
Mardiah Purnama, author
2016
UI - Skripsi (Membership)