APA
Morgan David L,, . (1998). The focus group guidebook. London: Sage Publications.
Chicago
Morgan David L,, . 1998. The focus group guidebook. London: Sage Publications.
Harvard
Morgan David L,, . (1998). The focus group guidebook. London: Sage Publications.
MLA
Morgan David L,, . The focus group guidebook. London: Sage Publications. 1998.