APA (7th ed.) Zitazioa

Creswell, J. W. (1994). Research design qualitative & quantitative approaches. Sage.

Chicago Style (17th ed.) Zitazioa

Creswell, John W. Research Design Qualitative & Quantitative Approaches. London: Sage, 1994.

MLA (9th ed.) Zitazioa

Creswell, John W. Research Design Qualitative & Quantitative Approaches. Sage, 1994.