Johnson, D. W., & Johnson, F. P. (2003). Joining together: Group theory and group skills (8th ed.). Allyn and Bacon.
Lua i Stíl Chicago (17ú heag.)Johnson, David W., agus Frank Pierce Johnson. Joining Together: Group Theory and Group Skills. 8th ed. Boston: Allyn and Bacon, 2003.
Lua MLA (9ú heag.)Johnson, David W., agus Frank Pierce Johnson. Joining Together: Group Theory and Group Skills. 8th ed. Allyn and Bacon, 2003.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.