Creswell JW. Qualitative inquiry and research design: choosing among five traditions. California: Sage Publications; 1998.
Michael Quinn P. Qualitative research & evaluation methods. California: Sage Publications; 2002.
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Creswell JW. Qualitative inquiry and research design: choosing among five traditions. California: Sage Publications; 1998.
Michael Quinn P. Qualitative research & evaluation methods. California: Sage Publications; 2002.