How to condut telephone surveys
Linda P. Bourque, Eve P. Fielder
Thousand Oaks : SAGE PUBLIKATION, 2003,
 Buku Referensi
Hoxley, Mike
Good practice guide: building condition surveys
[RIBA , ], 2009
 eBooks
Roman, Murray
Telephone marketing
McGraw-Hill, 1976
 Buku Teks
Briggs, Julie K.
Telephone triage protocols for nurses
Lippincott , 2002
 Buku Teks
Anderson, Kristin
Great customer service on the telephone
American Management Association, 1992
 eBooks