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1
Joining together : group theory and group skills / David W. Johnson, Frank P. Johnson.
Boston : Allyn and Bacon, c1994.
xiv, 609 p. : ill. ; 24 cm.
2
Joining together : group theory and group skills / David W. Johnson, Frank P. Johnson.
Boston : Allyn and Bacon, c2000.
xii, 643 p . : ill. ; 23 cm.