Holiday Ryan. (2014). Obstacle is the Way: The Ancient Art of turning adversity to advantage. Profile Books Ltd.
Chicago-referens (17:e uppl.)Holiday Ryan. Obstacle Is the Way: The Ancient Art of Turning Adversity to Advantage. London: Profile Books Ltd, 2014.
MLA-referens (9:e uppl.)Holiday Ryan. Obstacle Is the Way: The Ancient Art of Turning Adversity to Advantage. Profile Books Ltd, 2014.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.