Research design :
Creswell, John W.
Research design : qualitative, quantitative, and mixed methods approches / John W. Creswell. - 3rd ed. - London : SAGE, 2009. - xxix, 260 p.
1412965576 :
Social sciences--Research--Methodology.
Social sciences--Statistical methods.
Research design : qualitative, quantitative, and mixed methods approches / John W. Creswell. - 3rd ed. - London : SAGE, 2009. - xxix, 260 p.
1412965576 :
Social sciences--Research--Methodology.
Social sciences--Statistical methods.