Stefferud, Alfred, editor
United States. Government Printing Office, 1966
Buku Referensi
Kothari, Ashish
Universities Press, 2007
Buku Teks
Walters, Martin
Miles Kelly, 2000
Buku Referensi
photographer Li Shaobai ; writer Yang Xiagui
Wai wen chu ban she, 2007
Buku Referensi
Wen, Xiaoping, author
Pei gen, min, 1980
Buku Teks