Moran, Patrick R.
Heinle, Cengage Learning, 2001
Buku Teks SO
Ur, Penny
Cambridge University Press, 1991
Buku Teks SO
Helen L. Van Hoozer [and others]
Appleton Century Crofts, 1987
Buku Teks SO
by Nancy I. Whitman [and others]
Appleton Century, 1986
Buku Teks SO
Ur, Penny
Cambridge University Press, 2006
Buku Teks