Goodstein, Eban S., author
Island Press, 1999
Buku Teks
Hira, Ron, author
American Management Association, 2008
eBooks
Artikel Jurnal
Gisty Ajeng Septami, author
Universitas Indonesia, 2016
UI - Skripsi (Membership)
Isaacson, Walter, author
Bentang, 2011; 2014
Buku Teks