Kneen, W.R.
The English Language Book Society, 1974
Buku Teks SO
Malone, Leo J.
John Wiley & Sons, 1981
Buku Teks SO
Roach, Don
McGraw-Hill, 1979
Buku Teks SO
Sherman, Alan
Houghton Mifflin, 1992
Buku Teks SO
Malone, Leo J.
John Wiley & Sons, 1994
Buku Teks SO