Anderson, Kristin, author
Great customer service on the telephone
American Management Association, 1992
 eBooks
Frey, James H., author
Survey research by telephone
Sage Publications, 1983
 Buku Referensi
Toepoel, Vera, author
Doing surveys online
SaGE Publications , 2016
 Buku Teks
Marion Wesley Todd
Engineering surveys elementary
Macmillan, 1934
 Buku Teks
Sample surveys in the Escap rigion
United Nations-ESCAP , 1985
 Buku Teks
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