@book{536,
  keywords = {Social sciences Research Methodology, Social sciences Statistical methods},
  author = {John Creswell},
  title = {Research design: Qualitative, quantitative, and mixed methods approaches},
  year = {2003},
  edition = {2},
  publisher = {Sage Publications},
  address = {Thousand Oaks, Calif.},
  isbn = {9780761924425 (pbk.)},
}