Fern, Edward F., author
Advanced focus group research
Sage, 2001
Buku Teks
Focus group research; Vol. 1-4
edited Graham R. Walden
Sage, 2012
Buku Referensi
Morgan, David, L., author
Basic and advanced focus groups
Sage, 2019
Buku Teks
Focus groups in social research
by Michael Bloor ... [et al.]
Sage, 2002
Buku Teks
Advanced Materials Research
Trans Tech, 2011
Majalah, Jurnal, Buletin
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