Holiday Ryan. (2014). Obstacle is the Way: The Ancient Art of turning adversity to advantage. Profile Books Ltd.
Citace podle Chicago (17th ed.)Holiday Ryan. Obstacle Is the Way: The Ancient Art of Turning Adversity to Advantage. London: Profile Books Ltd, 2014.
Citace podle MLA (9th ed.)Holiday Ryan. Obstacle Is the Way: The Ancient Art of Turning Adversity to Advantage. Profile Books Ltd, 2014.
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