Punch, K. (2005). Introduction to social research: Quantitative and qualitative approaches (2nd Ed.). SAGE Publications.
Lua i Stíl Chicago (17ú heag.)Punch, Keith. Introduction to Social Research: Quantitative and Qualitative Approaches. 2nd Ed. London ; Thousand Oaks, Calif.: SAGE Publications, 2005.
Lua MLA (9ú heag.)Punch, Keith. Introduction to Social Research: Quantitative and Qualitative Approaches. 2nd Ed. SAGE Publications, 2005.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.