Erteschik-Shir, Nomi, author
The dynamics of focus structure
Cambridge University Press, 2006
 Buku Teks
Morgan, David, L., author
Basic and advanced focus groups
Sage, 2019
 Buku Teks
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
Schwesinger, Borries, author
The form book : best practice in creating forms for printed and online use
Thames & Hudson, 2010
 Buku Teks
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