- Onwuegbuzie, A., Bustamante, R. & Nelson, J. (2010). Mixed research as a tool for developing quantitative instruments.
- Yazan, B. (2015). Three Approaches to Case Study Methods in Education: Yin, Merriam, and Stake. The Qualitative Report, 20(2), 134-152. Recuperado de http://nsuworks.nova.edu/tqr/v
ol20/iss2/12 - Groenewald, T. (2004). A Phenomenological Research Design Illustrated. International Journal of Qualitative Methods, 3(1), p. 3-26.