Evaluation Research Society, Cook, T. D., & Reichardt, C. S. (1979). Qualitative and quantitative methods in evaluation research. Sage Publications.
Chicago-referens (17:e uppl.)Evaluation Research Society, Thomas D. Cook, och Charles S. Reichardt. Qualitative and Quantitative Methods in Evaluation Research. Beverly Hills, Calif: Sage Publications, 1979.
MLA-referens (9:e uppl.)Evaluation Research Society, et al. Qualitative and Quantitative Methods in Evaluation Research. Sage Publications, 1979.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.