Pawson, R. , Tilley, N. (1997) Realistic Evaluation. London: Sage .
2.
Ryan, S. , Porter, S. (1996) Breaking the boundaries between nursing and sociology: A critical realist ethnography of the theory-practice gap . Journal of Advanced Nursing24: 413-420 .
3.
Wainwright, S.P. (1997) A new paradigm for nursing: The potential of realism . Journal of Advanced Nursing26: 1262-1271 .