Punch, Keith, F. Introduction to social research: Quantitative and qualitative approaches - 2nd Edition - New Delhi Sage Publications India Pvt. Ltd. 2005 - xvi, 320p. ISBN: RS 1990.83 (UKP 25.99) Source: RS 1990.83 (UKP 25.99) Dewey Class. No.: 300.72 PUN