Focus group research; Vol. 1-4
edited Graham R. Walden
Sage, 2012
Buku Referensi
Morgan, David, L.
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
Giles, David C.
Advanced research methods in psychology
Routledge, 2002
Buku Teks