HARPINE, E. C. (2013). Prevention groups. SAGE.
Cita Chicago (17th ed.)HARPINE, Elaine Clanton. Prevention Groups. SAGE, 2013.
Cita MLA (9th ed.)HARPINE, Elaine Clanton. Prevention Groups. SAGE, 2013.
Atenció: Aquestes cites poden no estar 100% correctes.