MacDonald, L. (2004). Learn to be an optimist: Visualise your way to success, fine lifelong confidence and happiness, discover self-belief. Duncan Baird.
Chicago-referens (17:e uppl.)MacDonald, Lucy. Learn to Be an Optimist: Visualise Your Way to Success, Fine Lifelong Confidence and Happiness, Discover Self-belief. London: Duncan Baird, 2004.
MLA-referens (8:e uppl.)MacDonald, Lucy. Learn to Be an Optimist: Visualise Your Way to Success, Fine Lifelong Confidence and Happiness, Discover Self-belief. Duncan Baird, 2004.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.