Useful books
Cohen, L., Manion, L. and Morrison, K. (2007) Research Methods in Education, 6th edn. London: Routledge.
Langdridge, D. and Hagger-Johnson, G. (2009) Introduction to Research Methods and Data Analysis in Psychology, 2nd edn. Harlow: Pearson Education Ltd.
Newby, P. (2014) Research Methods for Education, 2nd edn. Harlow: Pearson Education Ltd.