Tsurumi, Yoshi
Ballinger Pub. Co., 1984
Buku Teks
Globerman, Steven
Prentince-Hall, 1986
Buku Teks
Johnson, Debra
Routledge, Taylor & Francis group, 2003
Buku Teks
Robinson, Richard D.
Rinehart and Winston, 1964
Buku Teks
Michael R. Czinkota, Ilkka A. Ronkainen, Michael H. Moffet, Eugene O. Moynihan
Harcourt College publishers, 2001
Buku Teks