Bhattacharya, K., (2017) Fundamentals of Qualitative Research: A Practical Guide, Routledge.
Crabtree, C. D. (2006) Qualitative Research Guidelines Projecthttp://www.qualres.org/HomeWhat-3513.html.
Heigham, J., & Croker, R. (Eds.). (2009). Qualitative research in applied linguistics: A practical introduction. Springer.
Saldana, J (2011) Fundamentals of Qualitative Research: Understanding Qualitative Research, Oxford University Press.