Cita APA (7a ed.)

Krueger, R. A. (1994). Focus groups: A practical guide for applied research (2nd ed.). Sage.

Cita Chicago Style (17a ed.)

Krueger, Richard A. Focus Groups: A Practical Guide for Applied Research. 2nd ed. Thousand Oaks [etc.]: Sage, 1994.

Cita MLA (9a ed.)

Krueger, Richard A. Focus Groups: A Practical Guide for Applied Research. 2nd ed. Sage, 1994.