Alexander, Franz
The Free Press, 1956
Buku Teks
Andini Prima Ayu Pangesti Yusuf, author
UI - Makalah dan Kertas Kerja
Roussopulos, Dimitrios I
Black Rose Books, 1975
Buku Teks
Fook, Janis
Allen & Unwin, 1993
Buku Teks
Anderson, Chris, author
House Britain Business Books, 2009
Buku Teks