Zeithaml, V. A. B. (2013). Services Marketing (7th ed.). Pearson Education.
Lua i Stíl Chicago (17ú heag.)Zeithaml, Valarie A; Bitner. Services Marketing. 7th ed. New Delhi: Pearson Education, 2013.
Lua MLA (9ú heag.)Zeithaml, Valarie A; Bitner. Services Marketing. 7th ed. Pearson Education, 2013.
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