Van Ekeren, G. (2001). 12 simple secrets of happiness at work: Finding fulfillment, reaping rewards. Prentice Hall.
Citace podle Chicago (17th ed.)Van Ekeren, Glenn. 12 Simple Secrets of Happiness at Work: Finding Fulfillment, Reaping Rewards. Upper Saddle River, NJ: Prentice Hall, 2001.
Citace podle MLA (8th ed.)Van Ekeren, Glenn. 12 Simple Secrets of Happiness at Work: Finding Fulfillment, Reaping Rewards. Prentice Hall, 2001.
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