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Samson, Alain and Kirby, Justin (2008) Who or what really influences word of mouth trends? Admap (July). pp. 48-51. ISSN 0001-8295
Kirby, Justin and Samson, Alain (2008) Customer advocacy metrics: the NPS theory in practice. Admap, Feb. pp. 17-19. ISSN 0001-8295