Buku Teks
Scott, W. Richard, 1932-
Holt, Rinehart and Winston, 1970
Buku Teks SO
by Delbert S. Elliott ...[et al.]
Cambridge University Press, 2007
Buku Teks
Tucker, W.T.
Holt, Renehart and Winston, 1964
Buku Teks SO
Hardey, Michael
Open University Press, 1998
Buku Teks SO