Bryman, A. (2006). Integrating quantitative and qualitative research: how is it done?. Qualitative Research, 6(1): 97-113. DOI: 10.1177/1468794106058877.
Creswell, J. W., Hanson, W. E., Clark Plano, V. L. and Morales, A. (2007). Qualitative Research Designs: selection and implementation. The Counselling Psychologist, 35: 236-264. DOI: 10.1177/0011000006287390
Bailey, S. (2011). Academic Writing. A Handbook for International Students. London
and New York: Routledge Taylor and Francis.
Gillett, A., Hammond, A. and Martala, M. (2009). Inside Track. Successful Academic
Writing. England: Pearson Longman
Henning, E., Gravett, S. and Van Rensburg, W. (2002). Finding your way in Academic
Writing. Pretoria: Van Schaik Publishers.
Merriam, S. B. (2009). Qualitative Research: A Guide to design and implementation. San Francisco: Jossey-Bass.