Hammersley, M. ( 1992). Deconstructing the qualitative/quantitative divide. In M. Hammersley (Ed.), What’s wrong with ethnography? (pp. 159-173). London: Routledge.
2.
Maxwell, J.A. ( 2004). Causal explanation, qualitative research, and scientific inquiry in education. Educational Researcher, 33(2), 3-11.
3.
Pawson, R. ( 2006). Evidence-based policy: A realist perspective. London: SAGE.