Morgan, David, L., author
Basic and advanced focus groups
Sage, 2019
 Buku Teks
Focus group research; Vol. 1-4
edited Graham R. Walden
Sage, 2012
 Buku Referensi
Johnson, David W., 1940-, author
Joining together : group theory and group skills
Allyn and Bacon, 1997
 Buku Teks
Johnson, David W., 1940-, author
Joining together : group theory and group skills
Allyn and Bacon, 2000
 Buku Teks
Johnson, David W., 1940-, author
Joining together : group theory and group skills
Pearson Education, 2006
 Buku Teks
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