Punch, K. F. (1998). Introduction to social research: Quantitative and qualitative approaches. SAGE Publications.
Lua i Stíl Chicago (17ú heag.)Punch, Keith F. Introduction to Social Research: Quantitative and Qualitative Approaches. London, Thousand Oaks, Calif: SAGE Publications, 1998.
Lua MLA (9ú heag.)Punch, Keith F. Introduction to Social Research: Quantitative and Qualitative Approaches. SAGE Publications, 1998.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.