Norton, George W., author
McGraw-Hill, 1993
Buku Teks
Ross, Robert C., author
McGraw-Hill, 1951
Buku Teks
Mellor, John W., author
Cornell University Press, 1966
Buku Teks
Thomson, Edgar
Thomson Nelson and Sons Ltd. , 1949
Buku Teks
Elkan, Walter
The English Language Book Society ; Penguin Books, 1973
Buku Teks