Customer service : hot seat dvd
Irwin, McGraw-Hill, 2005
 Multimedia
Customer service : hot seat dvd
Irwin, McGraw-Hill, 2005
 Multimedia
Knapp, Donna
A guide to customer service skills for the help desk professional
Course Technology, Cengage Learning, 2011
 Buku Teks SO
Syarifah Fatimah Fitria
Segmentasi konsumen berdasarkan customer lifetime value menggunakan analisis big data = Customer segmentation based on customer lifetime value using big data analytics
Fakultas Eknonomi dan Bisnis Universitas Indonesia, 2018
 UI - Tesis Membership
Goetsch, David L.
Effective customer services : ten steps for technical professions
Pearson-Prentice-Hall, 2004
 Buku Teks SO