Pawson, R., Greenhalgh, T., Harvey, G., & Walshe, K. (2005). Realist review--a new method of systematic review designed for complex policy interventions.

Pawson, R., T. Greenhalgh, G. Harvey, and K. Walshe. Realist Review--a New Method of Systematic Review Designed for Complex Policy Interventions. 2005.

Pawson, R., et al. Realist Review--a New Method of Systematic Review Designed for Complex Policy Interventions. 2005.