"creswell, john w. "
"research design: qualitative,quantitative,and mixed methods approaches/ john.w. creswell" - 3 ed. - london : sage 2009. - "xxix, 260p.; 26 cm."
978-1-4129-6557-6
social sciences-research-methodology
H62 / .C69 2009
"research design: qualitative,quantitative,and mixed methods approaches/ john.w. creswell" - 3 ed. - london : sage 2009. - "xxix, 260p.; 26 cm."
978-1-4129-6557-6
social sciences-research-methodology
H62 / .C69 2009