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Lua i Stíl Chicago (17ú heag.)Wirtz, Jochen, agus Christopher Lovelock. Services Marketing: People, Technology, Strategy. 8th ed. Chennai: World Scientific Publishing Co. In, 2016.
Lua MLA (9ú heag.)Wirtz, Jochen, agus Christopher Lovelock. Services Marketing: People, Technology, Strategy. 8th ed. World Scientific Publishing Co. In, 2016.
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