Yerkes, L. (2007). Fun works: Creating places where people love to work (2nd ed., updated and expanded.). Berrett-Koehler Publishers.
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Chicago-čujuhus (17. p.)
Yerkes, Leslie. Fun Works: Creating Places Where People Love to Work. 2nd ed., updated and expanded. San Francisco: Berrett-Koehler Publishers, 2007.
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MLA-čujuhus (9. p.)
Yerkes, Leslie. Fun Works: Creating Places Where People Love to Work. 2nd ed., updated and expanded. Berrett-Koehler Publishers, 2007.
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