Foster, T. (1997). 101 ways to boost customer satisfaction. Kogan Page.
Lua i Stíl Chicago (17ú heag.)Foster, Timothy. 101 Ways to Boost Customer Satisfaction. New Delhi: Kogan Page, 1997.
Lua MLA (9ú heag.)Foster, Timothy. 101 Ways to Boost Customer Satisfaction. Kogan Page, 1997.
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