Pawson, R., & Metzler, K. (2013). The science of evaluation: A realist manifesto. SAGE.
Lua i Stíl Chicago (17ú heag.)Pawson, Ray, agus Katie Metzler. The Science of Evaluation: A Realist Manifesto. Los Angeles: SAGE, 2013.
Lua MLA (9ú heag.)Pawson, Ray, agus Katie Metzler. The Science of Evaluation: A Realist Manifesto. SAGE, 2013.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.