Punch, Keith .F. Introduction to social research : Quantitative and qualitative approaches / Keith .F. Punch. - 3rd ed. - London : Sage, c2014 - xi, 386 p. : ill. ; 23 cm. ISBN: 9781446240939 Subjects--Topical Terms: Social sciences--ResearchEmpirical Social Research. Dewey Class. No.: 300.72 / PUN