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American Management Association;, 2009
eBooks
Schniederjans, Marc J., author
Allyn and Bacon, 1992
Buku Teks
editor A. Dale Timpe
PT Elex Media Komputindo, 2000
Buku Teks
A. Dale Timpe, editor
Elex Media Komputindo, 1991
Buku Teks
Putri Larasati, author
Fakultas Psikologi Universitas Indonesia, 2019
UI - Skripsi (Membership)