Collins, G. R. (1992). You can make a difference: 14 principles for influencing lives. Zondervan Publishing House.
Chicago-čujuhus (17. p.)Collins, Gary R. You Can Make a Difference: 14 Principles for Influencing Lives. Grand Rapids, MI: Zondervan Publishing House, 1992.
MLA-čujuhus (9. p.)Collins, Gary R. You Can Make a Difference: 14 Principles for Influencing Lives. Zondervan Publishing House, 1992.
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