Bowen, Christopher J., author
Focal Press, 2013
Buku Teks
Hudson, Richard
Basic Blackwell , 1984
Buku Teks
Macmillan, 1981
Buku Referensi
Makkink, H.J., author
Nijgh and Van Ditmar, 1951
Buku Teks
Healy, Phyllis M., author
The Institute of Nationale Language and The Summer Institute Linguistics, 1960
Buku Teks