HARPINE, E. C. (2013). Prevention groups. SAGE.
Chicago-čujuhus (17. p.)HARPINE, Elaine Clanton. Prevention Groups. SAGE, 2013.
MLA-čujuhus (9. p.)HARPINE, Elaine Clanton. Prevention Groups. SAGE, 2013.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.