Ray, M. L. (2004). The highest goal: The secret that sustains you in every moment. Berrett-Koehler.
Citace podle Chicago (17th ed.)Ray, Michael L. The Highest Goal: The Secret That Sustains You in Every Moment. San Francisco, CA: Berrett-Koehler, 2004.
Citace podle MLA (9th ed.)Ray, Michael L. The Highest Goal: The Secret That Sustains You in Every Moment. Berrett-Koehler, 2004.
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