Flick, U. (2002). An introduction to qualitative research (2nd ed.). SAGE Publications.
Lua i Stíl Chicago (17ú heag.)Flick, Uwe. An Introduction to Qualitative Research. 2nd ed. London ; Thousand Oaks, Calif.: SAGE Publications, 2002.
Lua MLA (8ú heag.)Flick, Uwe. An Introduction to Qualitative Research. 2nd ed. SAGE Publications, 2002.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.