Han, Jiantang, author
Cambridge University Press, 2012
Buku Teks
Wang, Gonglong, compiler
New Star Press, 2010
Buku Teks
Wang, gong long, author
Beijing Star Press, 2010
Buku Teks
Myongdo Language Institute, [date of publication not identified]
Buku Teks
Paton, Stewart, author
Routledge, 2008
Buku Referensi