Laski, Harold J., author
George Allen and Unwin, 1955
Buku Teks
Laski, Harold J., author
George Allen and Unwin, 1957
Buku Teks
Buku Teks
Hudson, Richard
Basic Blackwell , 1984
Buku Teks
Healy, Phyllis M., author
The Institute of Nationale Language and The Summer Institute Linguistics, 1960
Buku Teks