Laski, Harold J.
George Allen and Unwin, 1957
Buku Teks
Buku Teks
Hudson, Richard
Basic Blackwell , 1984
Buku Teks
Healy, Phyllis M.
The Institute of Nationale Language and The Summer Institute Linguistics, 1960
Buku Teks
Makkink, H.J.
Nijgh and Van Ditmar, 1951
Buku Teks