Michael R. Czinkota, Ilkka A. Ronkainen, Michael H. Moffet, Eugene O. Moynihan
Harcourt College publishers, 2001
Buku Teks
Ebert, Ronald J.
Prentice-Hall, 2009
Buku Teks
Hill, Charles W.L.
Crwin Mcgraw-Hill, 1998
Buku Teks
Hill, Charles W.L.
McGraw-Hill Irwin, 2003
Buku Teks
by Donald A. Ball ... [and others]
McGraw-Hill Irwin, 2002
Buku Teks