Flick, U. (2009). An introduction to qualitative research (Forth edition.). Sage Publications.
Lua i Stíl Chicago (17ú heag.)Flick, Uwe. An Introduction to Qualitative Research. Forth edition. Los Angeles ; New Delhi: Sage Publications, 2009.
Lua MLA (8ú heag.)Flick, Uwe. An Introduction to Qualitative Research. Forth edition. Sage Publications, 2009.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.