Stopford, John Morton
Basic Books, 1972
Buku Teks
Michael R. Czinkota, Ronkainen Ilkka A., Michael H.Moffett, Eugene O. Moynihan, ... [et al.].
Harcourt College publishers, 2001
Buku Teks
Wormald, Avison, author
Pan Books, 1973
Buku Teks
The University of Michigan Press , 1974
Buku Teks
Wild, John J., author
Prentice-Hall, 2003
Buku Teks