Globerman, Steven
Prentince-Hall, 1986
Buku Teks
Johnson, Debra, author
Routledge, Taylor & Francis group, 2003
Buku Teks
Michael R. Czinkota, Ilkka A. Ronkainen, Michael H. Moffet, Eugene O. Moynihan
Harcourt College publishers, 2001
Buku Teks
Ball, Donald A., author
Business Publications, 1985
Buku Teks
Moran, Robert T., author
Gulf, 1991
Buku Teks