Sheth, J. (2018). Customer Relationship Management (1st.). McGraw Hill.
Lua i Stíl Chicago (17ú heag.)Sheth, Jagdish. Customer Relationship Management. 1st. McGraw Hill, 2018.
Lua MLA (9ú heag.)Sheth, Jagdish. Customer Relationship Management. 1st. McGraw Hill, 2018.
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