Thorelli, H.B.
Penguin Books, 1973
Buku Teks
Yarker, K.A.
Business Books, 1976
Buku Teks
Czinkota, Michael R.
South Western Cengage Learning, 2013
Buku Teks
Carson, David
New York, John Wiley & Sons
Buku Teks
Masaaki Kotabe
John Wiley & Sons, 2015
Buku Teks