Gaya APA
Kasmir, .
(2017).
Customer Services Excellent (Teori dan Praktik)
.
Depok:
PT RajaGrafindo Persada.
Gaya MLA
Kasmir, .
"Customer Services Excellent (Teori dan Praktik)".
Depok:
PT RajaGrafindo Persada,
2017.
Text.