Yu, Yu-Lin
WLFD ROC Chapter , 1992
Buku Teks
by Franz Michael, Carl Linden, Jan Pryblyla, Jurgen Domes
Westview Press, 1990
Buku Referensi
Chang, Gordon G., author
Century, 2001
Buku Teks
Mackerras, Colin, author
Longman Cheshire, 1994
Buku Teks
Whiting, Allen S.
McGraw-Hill , 1980
Buku Teks