Niles Christensen [and others]
Illinois Scott, Foresman , 1984
Buku Teks
Drucker, Peter Ferdinand, 1909-2005
Harper & Brothers, 1959
Buku Teks SO
Raja Nazrin Shah
RNS Publications Sdn Bhd, 2006
Buku Referensi
Chin, Kon Yit
Jugra Publications, 2003
Buku Referensi
Magdad
Fakultas Ilmu Pengetahuan Budaya Universitas Indonesia, 1997
UI - Tesis Membership