Gaya APA
Williamson, D, L. (1982).
Group power : how to develop, lead, and help group achieve goals .
Englewood Cliffs, NJ:
Prentice Hall.
Gaya MLA
Williamson, David, L..
"Group power : how to develop, lead, and help group achieve goals".
Englewood Cliffs, NJ:
Prentice Hall,
1982.
Text.