Vaughan, Emmett J.
Essentials of risk management and insurance
John Wiley & Sons, 2001
 Buku Teks
Vaughan, Emmett J.
Essentials of insurance: a risk management perspective
John Wiley & Sons, 1992
 Buku Teks
Koontz, Harold
Essentials of management
McGraw-Hill, 1974
 Buku Teks
Koontz, Harold
Essentials of management
Tata McGraw-Hill, 1982
 Buku Teks
Massie, Joseph L.
Essentials of management
Prentice-Hall International, 1987
 Buku Teks