APA (7th ed.) Citation

Langford, J. D., & McDonagh, D. (2003). Focus groups: Supporting effective product development. Taylor & Francis.

Chicago Style (17th ed.) Citation

Langford, Joseph D., and Deana McDonagh. Focus Groups: Supporting Effective Product Development. London: Taylor & Francis, 2003.

MLA (8th ed.) Citation

Langford, Joseph D., and Deana McDonagh. Focus Groups: Supporting Effective Product Development. Taylor & Francis, 2003.