Greenbaum, T. L. (1993). The Handbook for Focus Group Research (Rev. ed.). Lexington Books An Imprint of Macmillan, Inc.

Greenbaum, Thomas L. The Handbook for Focus Group Research. Rev. ed. New York: Lexington Books An Imprint of Macmillan, Inc, 1993.

Greenbaum, Thomas L. The Handbook for Focus Group Research. Rev. ed. Lexington Books An Imprint of Macmillan, Inc, 1993.