Ritchie, J., & Lewis, J. (2003). Qualitative research practice: A guide for social science students and researchers. London : Sage Pubs.
Lua i Stíl Chicago (17ú heag.)Ritchie, Jane, agus Jane Lewis. Qualitative Research Practice: A Guide for Social Science Students and Researchers. London : Sage Pubs, 2003.
Lua MLA (9ú heag.)Ritchie, Jane, agus Jane Lewis. Qualitative Research Practice: A Guide for Social Science Students and Researchers. London : Sage Pubs, 2003.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.