by Kotler, Philip.
by Vernekar, S. S. ; Goel, Sandeep & Bhardwaj, B. R.
by Jain, J. N. ; Singh, P.P.
by zeithaml, valarie.
by Srinivasan, R.
by Roberts, Mary Lou | Zahay, Debra.
by Ramaswamy, V.S | Namakumari, S.
by Gupta D.K.
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