Levenson, Claude B., author
Editions Assouline, 1997
Buku Referensi
Moe, Dean, author
Augsburg Publishing House, 1985
Buku Referensi
Harper , 1962
Buku Teks
Hall, James, author
John murray, 1995
Buku Referensi
Ong, Hean-Tatt
Malaysia Pelanduk Publications, 1994
Buku Teks