Johnson, D. W., & Johnson, F. P. (1997). Joining together: Group theory and group skills (6th ed.). Allyn and Bacon.
Chicago Style (17. basım) AtıfJohnson, David W., ve Frank P. Johnson. Joining Together: Group Theory and Group Skills. 6th ed. Boston: Allyn and Bacon, 1997.
MLA (9th ed.) AtıfJohnson, David W., ve Frank P. Johnson. Joining Together: Group Theory and Group Skills. 6th ed. Allyn and Bacon, 1997.
Uyarı: Bu alıntı herzaman %100 doğru olmayabilir..