HARPINE, E. C. (2013). Prevention groups. SAGE.
Lua i Stíl Chicago (17ú heag.)HARPINE, Elaine Clanton. Prevention Groups. SAGE, 2013.
Lua MLA (9ú heag.)HARPINE, Elaine Clanton. Prevention Groups. SAGE, 2013.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.