1. Black Box Testing, http://softwaretestingfundamentals.com/black-box-testing/. Last accessed 16 Mar 2018.
2. Boloix, G., & Robillard, P. N. (1995). A software system evaluation framework. Computer, 28, 17–26. https://doi.org/10.1109/2.476196
3. Borsci, S., Federici, S., & Lauriola, M. (2009). On the dimensionality of the system usability scale: A test of alternative measurement models. Cognitive Processing, 10, 193–197. https://doi.org/10.1007/s10339-009-0268-9
4. Brooke, J. (1996). SUS-A quick and dirty usability scale. In Usability evaluation in industry (Vol. 189, pp. 4–7). Taylor & Francis.
5. Corona, A. What is usability and why should i care? https://digitalconference.yale.edu/what-usability-and-why-should-i-care. Last accessed 14 Feb 2019.