Sharon F. Rallis & Gretchen B. Rossman 
Introduction to Qualitative Research [PDF ebook] 
Learning in the Field

The updated Fourth Edition of Rossman and Rallis’s popular introductory text leads the new researcher into the field by explaining the core concepts through theory, research, and applied examples. Woven into the chapters are three themes that are the heart of the book: first, research is about learning; second, research can and should be useful; and finally, a researcher should practice the highest ethical standards to ensure that a study is trustworthy. The Fourth Edition includes an elaborate discussion of systematic inquiry as well as a nuanced discussion of developing a conceptual framework.