Users' hierarchical perspectives on library service quality: a "LibQUAL+" study
 Artikel Jurnal
Psychometric properties of scores from the web-based libQual+study of perceptions of library service quality
 Artikel Jurnal
Zeithaml, Valarie A.
Delivering quality service : balancing customer perceptions and expectations
Free Press, 1990.
 Buku Teks
Hernon, Peter
Assessing service quality: satisfying the expectations of library customers
American Library Association, 2015
 Buku Teks
Users'perceptions of library service quality: a libqual+qualitative study
 Artikel Jurnal