Hsieh, T. (2010). Delivering Happiness: A Path to Profits, Passion, and Purpose. Grand Central Publishing.
Citace podle Chicago (17th ed.)Hsieh, Tony. Delivering Happiness: A Path to Profits, Passion, and Purpose. New York: Grand Central Publishing, 2010.
Citace podle MLA (9th ed.)Hsieh, Tony. Delivering Happiness: A Path to Profits, Passion, and Purpose. Grand Central Publishing, 2010.
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