Fisher, David T.
Prentice-Hall, 1991
Buku Referensi
Andrews, jean
Course technology cengage learning, 2013
Buku Teks SO
Andrews, jean
Course Technology, 2013
Buku Teks SO
Keet, Ernest E.
Addison-Wesley, 1984
Buku Teks SO
Andrews, jean
Thomson Course Technology, , 2013
Buku Teks