Oka A. Yoeti, author
Pradnya Paramita, 2005
Buku Teks
Health Insurance Association, 2002
Buku Teks
Safirah Pramarta, author
2015
UI - Skripsi (Membership)
Zeithaml, Valarie A., author
Free Press, 1990.
Buku Teks
Knapp, Donna, author
Course Technology, Cengage Learning, 2011
Buku Teks