Cathy Lewin & Bridget Somekh 
Theory and Methods in Social Research [PDF ebook] 

This new edition provides a scholarly and readable introduction to all the key qualitative and quantitative research methodologies and methods, enabling postgraduate and masters-level students and new researchers to reflect on which ones suit their needs and to receive guidance on how to find out more. With chapters written by experienced research practitioners, this second edition has been extensively expanded and updated. There are seven completely new chapters, as well as:- new material on literature reviews- a new introduction to quantitative methods — an expanded glossary — Weblinks with free access to a wide range of peer-reviewed journal articles- an annotated bibliography with conversational notes from authors in each chapter.This book will act as your ‘expert friend’ throughout your research project, providing advice, explaining key concepts and the implications for your research design, and illustrating these with examples of real research studies.