Lethbridge, Henry J.
Hong Kong Dragonfly Books 1965
Buku Teks
Nguyen, van Canh
Stanford: Hoover Institution Press, Stanford University, 1983
Buku Teks
Emil Reza Razali, examiner
New York Barron's Educational Series 1970,
Buku Teks
Hongkong Kingsway International Publications 1981
Buku Referensi
Chang Liu
New York : Routledge , 2007
Buku Teks