Singh, P., & Kumar, J. N. (2009). customer relationship management (CRM). Regal.
シカゴスタイル引用形Singh, P.P, , Jinender N. Kumar. Customer Relationship Management (CRM). New Delhi: Regal, 2009.
MLA引用形式Singh, P.P, , Jinender N. Kumar. Customer Relationship Management (CRM). Regal, 2009.
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