International variations in measuring customer expectations
 Artikel Jurnal
Rangkuti, Freddy, author
Measuring customer satisfaction
Gramedia, 2002
 Buku Teks
Zeithaml, Valarie A., author
Delivering quality service : balancing customer perceptions and expectations
Free Press, 1990.
 Buku Teks
Gerson, Richard F., author
Mengukur Kepuasan Pelanggan=measuring customer satisfaction
PPM, 2002
 Buku Teks
Measuring caring : international research on caritas as healing
John Nelson, Jean Watson
Springer, 2012
 Buku Teks SO
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