Παραπομπή APA

JOHN W.CRESWELL. (2009). RESEARCH DESIGN (3.). SAGE PUBLICATIONS.

Παραπομπή Chicago Style

JOHN W.CRESWELL. RESEARCH DESIGN. 3. NEW DELHI: SAGE PUBLICATIONS, 2009.

Παραπομπή MLA

JOHN W.CRESWELL. RESEARCH DESIGN. 3. SAGE PUBLICATIONS, 2009.