Research Design : qualitative, quantitative, and mixed methods approaches /
by John W Creswell.
- 3rd ed.
- New Delhi : Sage, c2009.
- xxix,260p. : ill. ; 24 cm.
Includes bibliographical references and index.
9781412965569 9781412965576
Social sciences--Research--Methodology. Social sciences--Statistical methods Social service--Research--Methodology