Corey, M. S., Corey, G., & Corey, C. (2014). Groups: Process and practice (9th ed.). Brooks/Cole/Cengage Learning.
Lua i Stíl Chicago (17ú heag.)Corey, Marianne Schneider, Gerald Corey, agus Cindy Corey. Groups: Process and Practice. 9th ed. Belmont, Calif: Brooks/Cole/Cengage Learning, 2014.
Lua MLA (9ú heag.)Corey, Marianne Schneider, et al. Groups: Process and Practice. 9th ed. Brooks/Cole/Cengage Learning, 2014.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.