Buttle, F., & Maklan, S. (2022). Customer Relationship management (4th.). Routledge.
Lua i Stíl Chicago (17ú heag.)Buttle, Francis, agus Stan Maklan. Customer Relationship Management. 4th. New York: Routledge, 2022.
Lua MLA (9ú heag.)Buttle, Francis, agus Stan Maklan. Customer Relationship Management. 4th. Routledge, 2022.
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