Hardy, Darel W.
Wadsworth , 1975
Buku Teks SO
Varberg, Dale E.
Pearson/Prentice-Hall, 2007
Buku Teks
Bartle, Robert Gardner, 1927-
Scott, Foresman, 1968
Buku Teks SO
Sherwood, G.E.F.
Prentice-Hall, 1946
Buku Teks
Ayres, Frank, 1901-1994
[Publisher not identified], [Date of publication not identified]
Buku Teks SO