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1
Research design : qualitative, quantitative, and mixed method approaches / John W. Creswell, J David Creswell.
Thousand Oaks, Calif. : Sage Publications, 2018
388p. : ill.; 29 cm.
2
Research design : qualitative, quantitative, and mixed method approaches / John W. Creswell.
Thousand Oaks, Calif. : Sage Publications, 2014
xxix, 273 p. : ill.; 30 cm.
3
Research design : qualitative, quantitative, and mixed method approaches / John W. Creswell.
Thousand Oaks, Calif. : Sage Publications, 2003
xxvi, 246 p. : ill.; 25 cm.