Brown, Robert F., author
Wadsworth, 1980
Buku Teks
Barnett, Raymond A., author
Dellem , 1981
Buku Teks
Barnett, Raymond A., author
Dellen, 1981
Buku Teks
Lial, Margareth L., author
Scott, Foresman, 1979
Buku Teks
Lial, Margaret L., author
Harper Colins, 1995
Buku Teks