1. Bangor A, Kortum PT, Miller JT (2008) An empirical evaluation of the system usability scale. Int J Hum Comp Interact 24:574–594
2. Bentler PM (1990) Comparative fit indexes in structural models. Psychol Bull 107:238–246
3. Bentler PM (2004) EQS structural equations modeling software (Version 6.1) (Computer software). Multivariate Software, Encino
4. Brooke J (1996) SUS: a 'quick and dirty' usability scale. In: Jordan PW, Thomas B, Weerdmeester BA, McClelland IL (eds) Usability evaluation in industry. Taylor & Francis, London, pp 189–194
5. Browne MW, Cudeck R (1993) Alternative ways of assessing model fit. In: Bollen KA, Long JS (eds) Testing structural equation models. Sage, Beverly Hills, pp 136–162