Creswell, J. W., & Creswell, J. D. Research design: Qualitative, quantitative, and mixed methods approaches (Sixth edition.).
Citazione stile Chigago Style (17a edizione)Creswell, John W., e J. David Creswell. Research Design: Qualitative, Quantitative, and Mixed Methods Approaches. Sixth edition.
Citatione MLA (9a ed.)Creswell, John W., e J. David Creswell. Research Design: Qualitative, Quantitative, and Mixed Methods Approaches. Sixth edition.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.