Rossman, G. B., & Rallis, S. (2012). Learning in the field: An introduction to qualitative research (3rd ed.). Sage.

Rossman, Gretchen B., and Sharon Rallis. Learning in the Field: An Introduction to Qualitative Research. 3rd ed. Los Angeles: Sage, 2012.

Rossman, Gretchen B., and Sharon Rallis. Learning in the Field: An Introduction to Qualitative Research. 3rd ed. Sage, 2012.