Hans, Kenneth B.
Creative salesmanship : understanding essentials /by Kenneth B. Hass and John W. Ernest
Collier Macmillan , 1974
 Buku Teks
Horwath, Ernest B.
Hotel accounting
John Wiley & Sons, 1977
 Buku Teks
Daniels, John D.
International business: environments and operations / John D. Daniels, Ernest W. Ogram, dan Lee H. Radebaugh
Addison-Wesley, 1976
 Buku Teks
Beams, Floyd A.
Advanced accounting / Floyd A. Beams, John A. Brozovsky, Craig D. Shoulders
Prentice-Hall, 2000
 Buku Teks
Donnell, John D.
Law for business / John D. Donnell, A. James Barnes and Michael B. Metzger
Irwin Homewood, 1983
 Buku Teks