Creswell, John W.
Research design : qualitative, quantitative, and mixed methods approaches /
John W. Creswell.
- 4th ed.
- Thousand Oaks : SAGE Publications, 2014.
- xxix, 273 p. : ill., charts, port.
Includes bibliographical references (p. 251-260) and indexes.
Social sciences--Research--Methodology.
Social sciences--Statistical methods.
H62