Source: Slide 3: Based on Plato's quote: "Music gives a soul to the universe, wings to the mind, flight to the imagination and life to everything.” Slide 6, 16 and 17: 14th Dalai Lama, "The Art of Happiness", 1998. Slide 8: Stephen R. Covey, "The 7 Habits of Highly Effective People", 1989. Slide 10 and 14: Sheryl Sandberg, "Lean In", 2013. Slide 12: Napoleon Hill, "Think and Grow Rich", 1937. Slide 18: Tony Hsieh, "Delivering Happiness: A Path to Profits, Passion, and Purpose", 2010.

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