Craven, R. (2002). Customer is king: How to exceed their expectations. Virgin Books.
Citace podle Chicago (17th ed.)Craven, Robert. Customer Is King: How to Exceed Their Expectations. London: Virgin Books, 2002.
Citace podle MLA (9th ed.)Craven, Robert. Customer Is King: How to Exceed Their Expectations. Virgin Books, 2002.
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