APA
Morgan D. l., . (1988). Focus groups as qualitative research. SAGE publication, Newbury park: .
Chicago
Morgan David l, . 1988. Focus groups as qualitative research. SAGE publication, Newbury park: .
Harvard
Morgan D. l., . (1988). Focus groups as qualitative research. SAGE publication, Newbury park: .
MLA
Morgan David l, . Focus groups as qualitative research. SAGE publication, Newbury park: . 1988.