Zeithml, V. A. (1996). Service Marketing Valerie A. Zeithml. McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Zeithml, Valerie A. Service Marketing Valerie A. Zeithml. McGraw-Hill, 1996.
Lua MLA (8ú heag.)Zeithml, Valerie A. Service Marketing Valerie A. Zeithml. McGraw-Hill, 1996.
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