"EDMUNDS HOLLY, . (1999). FOCUS GROUP RESEARCH HAND BOOK. USA: NTC/CONTEMPORARY PUBLISHING GROUP.
"EDMUNDS HOLLY, . 1999. FOCUS GROUP RESEARCH HAND BOOK. USA: NTC/CONTEMPORARY PUBLISHING GROUP.
"EDMUNDS HOLLY, . FOCUS GROUP RESEARCH HAND BOOK. USA: NTC/CONTEMPORARY PUBLISHING GROUP. 1999.