Singh, U.K.
International encyclopaedia of professional management : vol. 1, public relations management
Anmol Publications, 1998
 Buku Referensi
International encyclopaedia of marketing I
edited by A.S. Bhamhra, A.K. Chaudhary
Anmol Publications, 1998
 Buku Referensi
Bolt, Gordon
Encyclopaedia of management : marketing and sales vol. 6
Crest publishing, 1999
 Buku Referensi
Lewis, Keith
The Art of marketing: International marketing volume 2
Crest, 2001
 Buku Teks
Singh, U.K.
International encyclopedia of professional management : vol. 3, Strategic management
Anmol Publications, 1998
 Buku Referensi