Moss, Geoffrey, author
Gramedia, 1997
Buku Teks
Cason, Herbert N.
Halirang , 1995
Buku Teks
Sectio Rahmad Govinda, author
2017
UI - Skripsi (Membership)
Straub, Joseph T., author
American Management Association, 2000
eBooks
Dew, R. Beresford
Wiley, 1973
Buku Teks