Sheth, J. (2017). Customer Relationship Management (1st.). McGraw Hill.
Lua i Stíl Chicago (17ú heag.)Sheth, Jagdish. Customer Relationship Management. 1st. McGraw Hill, 2017.
Lua MLA (9ú heag.)Sheth, Jagdish. Customer Relationship Management. 1st. McGraw Hill, 2017.
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