Peelen, E. (2022). Customer relationship management. Pearson India Edu. Services.
Lua i Stíl Chicago (17ú heag.)Peelen, Ed. Customer Relationship Management. Noida: Pearson India Edu. Services, 2022.
Lua MLA (9ú heag.)Peelen, Ed. Customer Relationship Management. Pearson India Edu. Services, 2022.
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