Bartle, Robert Gardner, 1927-
Scott, Foresman, 1968
Buku Teks
Sherwood, G.E.F.
Prentice-Hall, 1946
Buku Teks
Stewart, James, 1941-
Brooks/Cole, 1991
Buku Teks
Larson, Ron, 1941-
Brooks/Cole, 2010
Buku Teks
Ayres, Frank, 1901-1994
[Publisher not identified], [Date of publication not identified]
Buku Teks SO