Banks, Jerry, author
John Wiley & Sons, c1989
Buku Teks
Besterfield, Dale H., author
Pearson Education, 2004
Buku Teks
Besterfield, Dale H., author
Prentice-Hall, 1998
Buku Teks
Besterfield, Dale H., author
Prentice-Hall, 1994
Buku Teks
Besterfield, Dale H., author
Prentice-Hall, 1979
Buku Teks