Hoffman, Norman S.
McGraw-Hill, 1977
Buku Teks
Garden City Books, [date of publication not identified]
Buku Referensi
edited by Marcello A. Canuto and Jason Yaeger
Routledge, 2000
Buku Teks
Macmillan, 1996
Buku Referensi
Liu, Shangci
Zhonghua Book Company, 2007
Buku Teks