PUNCH, K. F. (2014). Introduction to social research: Quantitative & qualitative approaches. SAGE.
Lua i Stíl Chicago (17ú heag.)PUNCH, Keith F. Introduction to Social Research: Quantitative & Qualitative Approaches. SAGE, 2014.
Lua MLA (9ú heag.)PUNCH, Keith F. Introduction to Social Research: Quantitative & Qualitative Approaches. SAGE, 2014.
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