American Marketing Association, 1985
Buku Teks
Farjon, I.
Hague- Martinus Nijhoff, 1980
Buku Referensi
Kemp, Herman C., author
KITLV Press, 1990
Buku Referensi
Groenendael, Victoria M. Clara van, author
Foris Publications, 1987
Buku Referensi
Freedman, Ronald, author
Irvington, 1975
Buku Teks