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Text and materials:
Ruth M. Tappen. (2015). Nursing Research. Advanced Nursing Research: From Theory to Practice. (2nd ed.). ISBN-13: 9781284048308. ISBN-10: 1284048306. Publisher: Jones & Bartlett Learning
Section VI: Middle Range Theories
Chapter 21: Katharine Kolcaba’s Comfort Theory 
Chapter 22: Joanne Duffy’s Quality-Caring Model