1. Why you only need to test with 5 users;Nielsen,2000
2. Social research methods;Bernard,2000
3. Belief, attitude, intention, and behavior: An introduction to theory and research;Fishbein,1975
4. Draft guidance for industry and Food and Drug Administration staff—Applying human factors and usability engineering to optimize medical device design;Food and Drug Administration,2014
5. Qualitative inquiry and research design: Choosing among five traditions;Creswell,1998