Silmi Mustachfiroh Syahma Yani, author
Fakultas Psikologi Universitas Indonesia, 2006
UI - Tesis (Membership)
Bennett, Willard E., author
McGraw-Hill, 1959
Buku Teks
Topchik, Gary S., author
American Management Association, 2007
eBooks
Chrispinus Dimpudus, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 1997
UI - Tesis (Membership)
Iaconetti, Joan, author
Macmillan, 1985
Buku Teks