Creswell, J. W. Research Design 4ed. Sage.
Cita Chicago (17th ed.)Creswell, John W. Research Design 4ed. Sage.
Cita MLA (9th ed.)Creswell, John W. Research Design 4ed. Sage.
Atenció: Aquestes cites poden no estar 100% correctes.
Cita APA (7th ed.)