Klopf, D. W. (1985). Interacting in groups: Theory and practice (2ª ed.). Norton.
Lua i Stíl Chicago (17ú heag.)Klopf, Donald W. Interacting in Groups: Theory and Practice. 2ª ed. Norton, 1985.
Lua MLA (9ú heag.)Klopf, Donald W. Interacting in Groups: Theory and Practice. 2ª ed. Norton, 1985.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.