Niles Christensen [and others]
Illinois Scott, Foresman , 1984
Buku Teks
Raja Nazrin Shah
RNS Publications Sdn Bhd, 2006
Buku Referensi
Chin, Kon Yit
Jugra Publications, 2003
Buku Referensi
Magdad
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 1997
UI - Tesis Membership
edited by Hennig Cohen
Basic Book, 1969
Buku Teks