Gaya APA
Blumberg, A, &, R, T.
(1976).
Learning and change in Groups.
.
Harmondsworth:
Penguin Books.
Gaya MLA
Blumberg, Arthur, &, Robert, T.Golembiewski..
"Learning and change in Groups. ".
Harmondsworth:
Penguin Books,
1976.
Buku.