Michael B. Cutlip
Prentice-Hall, 1999
Buku Teks
Hanna, Owen T., author
Prentice-Hall, 1995
Buku Teks
Pritchard, Philip J.
WCB/McGraw-Hill, 1998
Buku Teks
Fenves, Steven J., author
Prentice-Hall, 1969
Buku Teks
Hostetter, Gene H., 1939-, author
Prentice-Hall, 1991
Buku Teks