Qualitative inquiry and research design: Choosing among five approaches. Creswell, J. W & Poth, C. N Sage publications.
bibtex   
@book{creswell2016qualitative,
	title        = {Qualitative inquiry and research design: Choosing among five approaches},
	author       = {Creswell, John W and Poth, Cheryl N},
	publisher    = {Sage publications},
	date         = 2016
}

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