Hartley, R.J.
Online searching: principles and practice
Bowker-Saur, 1990
 Buku Teks SO
Saad, Michel A.
Thermodynamics : principles and practice
Prentice-Hall, 1997
 Buku Teks
Hattersley, Michael E.
Management communication: principles and practice
McGraw-Hill, 1997
 Buku Teks SO
Wells, William D.
Advertising : principles and practice
Prentice-Hall, 1992
 Buku Teks SO
Kitchen, Philip J.
Public relations: principles and practice
Internasional Thomson Business Press, 1997
 Buku Teks SO