Klopf, D. W. (1985). Interacting in groups: Theory and practice (2ª ed.). Norton.
Chicago Style aipamenaKlopf, Donald W. Interacting in Groups: Theory and Practice. 2ª ed. Norton, 1985.
MLA aipamenaKlopf, Donald W. Interacting in Groups: Theory and Practice. 2ª ed. Norton, 1985.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.