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Bickman, L., & Athay, M. (2009-04-30). The Worst of all Possible Program Evaluation Outcomes. In The Field Research Survival Guide. : Oxford University Press. Retrieved 6 Apr. 2020, from https://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195325522.001.0001/acprof-9780195325522-chapter-9.