Bibliografia principal:
Deb, D., Dey, R., & Balas, V. E. (2012). Engineering Research Methodology. Singapore: Springer.
Bhattacherjee, A. (2012). Social Science Research: Principle Methods, and Practices. Scholar Commons -University of South Florida.
Macdonald, S., & Headlam, N. (2010). Research Methods Handbook. Manchester: LES.