Hongkong Kingsway International Publications 1981
Buku Referensi
Lethbridge, Henry J.
Hong Kong Dragonfly Books 1965
Buku Teks
Amsterdam : Noord-Hollandsche Uitg
Majalah, Jurnal, Buletin
Washington, D.C. World Bank 1999,
Buku Teks
New York, Department of Public Information United Nations, 1957
Buku Referensi