Juilland, Alphonse, author
Mouton, 1973
Buku Teks
Brinton, Laurel J.
Cambridge University Press, 1988
Buku Teks
Artikel Jurnal
Henschel, Astrid
Passport Books , 1994
Buku Teks
Chuang, Edward Chi-chang
Kanazawa Institute of Technology Press, 1981
Buku Referensi