Bryman, A. (2008) Social Research Methods, 3rd edn. Oxford: Oxford University Press.
Cresswell, J.W. (2011) Planning, Conducting, and Evaluating Qualitative Research, 4th edn, London: Pearson.
Newby, P. (2014) Research Methods for Education, 2nd edn. Harlow: Pearson Education Ltd.
O'Leary, Z. (2010) The Essential Guide to Doing Your Research Project. London: Sage.
Patterson, E.W. (2011) Initial teacher development in science: the impact of constructivist-informed practice on learning, Teacher Development, 15(1), pp69-86.