Babbie, E. (2016) The Practice of Social Science Research Boston: Cengage Learning.
Bryman, A. (2012) Social Research Methods New York: Oxford University Press
Lewis-Beck, M., Bryman, A., Liao, T. (2004) The Sage Encyclopedia of social science research methods (Volume 1) Thousand Oaks, California
Sarakantos, S. (2013) Social Research Sarantakos, S. (2013) Social Research (4th edition). Londres: Red Globe Press.
Kumar, R. (2012) Research Methodology: A Step-by-Step Guide for Beginners London: Sage
Becker, H. S. (1998) Tricks of the Trade: How to Think about Your Research while You’re Doing It Chicago: The University of Chicago Press
Corbin, & A. L. Strauss (2015) Basics of Qualitative Research: Techniques and Procedures for Developing Grounded Theory (4th Edition) - Thousand Oaks: Sage
Given, L. M. (Ed.). (2008) The Sage encyclopedia of qualitative research methods Sage publications
Creswell, J. W. (2013) Qualitative Inquiry & Research Design: Choosing among Five Approaches (3rd edition) - London: Sage