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
Fisher, B. Aubrey, 1937-, author
Small group decision making : communication and the group process
McGraw-Hill, 1980
 Buku Teks
Johnson, David W., 1940-, author
Joining together : group theory and group skills
Pearson, 2014
 Buku Teks
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