MacDonald, L. (2004). Learn to be an optimist: Visualise your way to success, fine lifelong confidence and happiness, discover self-belief. Duncan Baird.
Chicago-viite (17. p.)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-viite (8. p.)MacDonald, Lucy. Learn to Be an Optimist: Visualise Your Way to Success, Fine Lifelong Confidence and Happiness, Discover Self-belief. Duncan Baird, 2004.
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