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by Kotler, Philip; Armstrong, Gary
by Lee, Nancy R.; Kotler, Philip
by Gary Armstrong; Philip Kotler; Valerie Trifts; et al.
by Philip Kotler; Waldemar Pfoertsch; Uwe Sponholz
by Gary Armstrong/Philip Kotler
by Kotler, Philip; Bowen, John; Baloglu, Seyhmus
by Philip T. Kotler; Gary Armstrong
by Philip Kotler / John Bowen