APA-viite (7. p.)

Krueger, R. A., & Casey, M. A. (2009). Focus groups: A practical guide for applied research (4th edition.). Sage Publications.

Chicago-viite (17. p.)

Krueger, Richard A., ja Mary Anne Casey. Focus Groups: A Practical Guide for Applied Research. 4th edition. Thousand Oaks, California: Sage Publications, 2009.

MLA-viite (9. p.)

Krueger, Richard A., ja Mary Anne Casey. Focus Groups: A Practical Guide for Applied Research. 4th edition. Sage Publications, 2009.