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Horwitz, S., & Hoagwood, K. (2009-04-30). Developing Questions when the Perfect Instrument Is Not Available. In The Field Research Survival Guide. : Oxford University Press. Retrieved 20 Feb. 2020, from https://www.oxfordscholarship.com/view/10.1093/acprof:oso/9780195325522.001.0001/acprof-9780195325522-chapter-2.