Lua APA (7ú heag.)

Krueger, R. A. (1988). Focus groups: A practical guide for applied research. Sage Publications.

Lua i Stíl Chicago (17ú heag.)

Krueger, Richard A. Focus Groups: A Practical Guide for Applied Research. Newbury Park, Calif.: Sage Publications, 1988.

Lua MLA (8ú heag.)

Krueger, Richard A. Focus Groups: A Practical Guide for Applied Research. Sage Publications, 1988.

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