Tudor, K. (1999). Group counselling. Sage Publications.
Lua i Stíl Chicago (17ú heag.)Tudor, Keith. Group Counselling. London ; Thousand Oaks, CA: Sage Publications, 1999.
Lua MLA (9ú heag.)Tudor, Keith. Group Counselling. Sage Publications, 1999.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.