Zeithaml,Valarie A, & Bitner,Mary Jo Gremler,Dwanye D. Pandit,Ajay. (2019). Services Marketing (7th.). McGraw Hill.
Lua i Stíl Chicago (17ú heag.)Zeithaml,Valarie A, agus Bitner,Mary Jo Gremler,Dwanye D. Pandit,Ajay. Services Marketing. 7th. Chennai: McGraw Hill, 2019.
Lua MLA (9ú heag.)Zeithaml,Valarie A, agus Bitner,Mary Jo Gremler,Dwanye D. Pandit,Ajay. Services Marketing. 7th. McGraw Hill, 2019.
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