Shackelford, James F.
Pearson-Prentice Hall, 2005
Buku Teks SO
Shackelford, James F.
Prentice-Hall, 1996
Buku Teks SO
Meier, Michael L.
Pearson Education, 2005
Multimedia
Shackelford, James F.
Macmillan Press, 1990
Buku Teks SO
Shackelford, James F.
Prentice Hall International, 1996
Buku Teks SO