Research design : qualitative, quantitative, and mixed methods approaches /
John W. Creswell
- 4th ed.
- Thousand, Oaks : SAGE Publications, 2014.
- XXIX, 273 p. : ill. ; 26 cm.
Includes bibliographical references and index
9781452226095 9781452226101
Social sciences--Research--Methodology Social sciences--Statistical methods Ciencias sociales--Investigación--Metodología Ciencias sociales--Metodos estadísticos