Case, Karl E., author
Prentice-Hall, 2004
Buku Teks
Case, Karl E., author
Prentice-Hall, 1996
Buku Teks
Case, Karl E., author
Prentice-Hall, 2002
Buku Teks
Case, Karl E., author
Prentice-Hall, 1999
Buku Teks
Henderson, J. Vernon, author
Heath and Com, 1991
Buku Teks