APA
Punch Keith F,, . (2012). Introduction to social research : Quantitative and qualitative approaches. London: Sage Publications.
Chicago
Punch Keith F,, . 2012. Introduction to social research : Quantitative and qualitative approaches. London: Sage Publications.
Harvard
Punch Keith F,, . (2012). Introduction to social research : Quantitative and qualitative approaches. London: Sage Publications.
MLA
Punch Keith F,, . Introduction to social research : Quantitative and qualitative approaches. London: Sage Publications. 2012.