Johnson, D. W., & Johnson, F. P. (1987). Joining together: Group theory and group skills (3rd ed.). Prentice-Hall International, Inc..
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Chicago-čujuhus (17. p.)
Johnson, David W., juo Frank P. Johnson. Joining Together: Group Theory and Group Skills. 3rd ed. New Jersey: Prentice-Hall International, Inc., 1987.
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MLA-čujuhus (9. p.)
Johnson, David W., juo Frank P. Johnson. Joining Together: Group Theory and Group Skills. 3rd ed. Prentice-Hall International, Inc., 1987.
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