Raja Nazrin Shah, author
RNS Publications Sdn Bhd, 2006
Buku Referensi
Cheah, Jin Seng, author
Editions Didier Millet; Jugra Publications, 2011
Buku Referensi
Niles Christensen [and others]
Illinois Scott, Foresman , 1984
Buku Teks
Schodek, Daniel L., author
MIT Press, 1988
Buku Teks
edited by Hening Cohen
Basic Books, 1969
Buku Teks