Pratama, I., P., A., E.(2019).Customer Relationship Management (CRM) : Teori dan Praktek Berbasis Open Source (Dilengkapi CD) (Cet.1).Bandung:Penerbit Informatika.
Gaya MLA
Pratama, I, Putu, Agus, Eka."Customer Relationship Management (CRM) : Teori dan Praktek Berbasis Open Source (Dilengkapi CD)".Cet.1Bandung:Penerbit Informatika,2019.Textbook.