Patricia Burch & Carolyn J. Heinrich 
Mixed Methods for Policy Research and Program Evaluation [PDF ebook] 

This practical text equips students, researchers, and policymakers in the social sciences with the tools they need for applying mixed methods in policy research and program evaluation, from design, through data collection, and dissemination. Emphasizing the "how-to"-the set of conceptual and active tasks carried out by mixed methods researchers-the book is illustrated with rich case studies from the authors’ own research projects in education and public policy. These examples help readers identify and explain policy and program impacts and better understand the "why" and "how" of observed effects. Throughout the book, the authors describe challenges that both beginners and advanced scholars are likely to encounter when doing mixed methods research and recommend practical tools available to address them.