Cita APA (7th ed.)
Williamson, D. L. (1982). Group power: How to develop, lead, and help groups achieve goals. Prentice-Hall.
Cita Chicago (17th ed.)
Williamson, David L. Group Power: How to Develop, Lead, and Help Groups Achieve Goals. Englewood Cliffs, N.J.: Prentice-Hall, 1982.
Cita MLA (9th ed.)
Williamson, David L. Group Power: How to Develop, Lead, and Help Groups Achieve Goals. Prentice-Hall, 1982.
Atenció: Aquestes cites poden no estar 100% correctes.