Neckers, Douglas C., author
John Wiley & Sons, 1977
Buku Teks
O`Leary, Marion H., author
McGraw-Hill, 1976
Buku Teks
O`Leary, Marion H., author
McGraw-Hill, 1976
Buku Teks
Zlatkis, Albert, author
McGraw-Hill Kogakusha, 1973
Buku Teks
Norman, R.O.C., author
The English Language Book Society, 1978
Buku Teks