Johnson, D. W., & Johnson, F. P. (1987). Joining together: Group theory and group skills. Prentice-Hall.
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Chicago-čujuhus (17. p.)
Johnson, David W., juo Frank P. Johnson. Joining Together: Group Theory and Group Skills. Englewood Cliffs, N.J.: Prentice-Hall, 1987.
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MLA-čujuhus (9. p.)
Johnson, David W., juo Frank P. Johnson. Joining Together: Group Theory and Group Skills. Prentice-Hall, 1987.
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