APA-viite (7. p.)
Williamson, D. L. (1982). Group power: How to develop, lead, and help groups achieve goals. Prentice-Hall.
Chicago-viite (17. p.)
Williamson, David L. Group Power: How to Develop, Lead, and Help Groups Achieve Goals. Englewood Cliffs, N.J.: Prentice-Hall, 1982.
MLA-viite (9. p.)
Williamson, David L. Group Power: How to Develop, Lead, and Help Groups Achieve Goals. Prentice-Hall, 1982.
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