Bussmann, Hadumod, author
Routledge, 1996
Buku Referensi
Longman, 1984
Buku Referensi
edited by Henry Cecil
George Routledge & Sons, 1946
Buku Referensi
Han, Ying Shiyong, author
[publisher not identified], 1998
Buku Referensi
Terry, Patrick D., author
Addison-Wesley, 1986
Buku Teks