Quantitative Part
Ary, D., Jacobs, L. C. & Sorensen, C: Introduction to research in education, 2010. Wadsworth, Cengage Learning: Australia. Chapters 3, 5 & 6 (58 pp) .
Bryman, A. : Social research methods. 4th ed, 2012. Oxford: Oxford University Press . Chapters 8-13 (126 pp) .
Chamblis, D. F. & Schutt, R. K: Making sense of the social world: Methods of invstigation 3rd ed , 2010 . Pine Forge Press, Thousand Oaks: California. Chapter 7 (23 pp) .
Leedy, P. D., Ormrod, J. E: Practical research: Planning and design, 2013. Pearson: Boston. Chapter 2 & 4 (64 pp).
Shadish, W. R., Cook, T. D. & Campbell, D. T: Experimental and quasi-experimental designs for generalized causal inference, 2002. Houghton Mifflin Company: Boston. Chapter 1 & 9 (64 pp) .
Qualitative Part
Atkinson, P. and Hammersley, M. "Ethnography and Participant Observation". In Denzin, Norman K. and Yvonna S. Lincoln (eds.): Handbook of Qualitative Research, 1994. Thousand Oaks, Calif.. Pages 248-261 (13 pp) .
Brock-Utne, B: Reliability and validity in qualitative research within education in Africa, 1996. International Review of Education 42. Pages 1-17 (16 pp) . Online.
Bryman, A: Social research methods 4th ed , 2012. Oxford: Oxford University Press. Chapters 17-21, 23 (154 pp) .
Kleven, T. A: Validity and validation in qualitative and quantitative research, 2008. Nordic Educational research (Nordisk Pedagogik) 28. Pages 219-233 (14 pp) . Online.
Yin, R. K: Case study research: Design and methods 4th ed, 2009. London: Sage. Chapters 1-2 (63 pp) .