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Behind Happy Faces: taking charge of your mental health, a guide for young adults by 
Brief History of Happiness by 
Happiness Makeover: how to teach yourself to be happy and enjoy every day by 
Happiness: the science behind your smile by 
Happy at Last: the thinking person's guide to finding joy by 
Help Yourself: finding hope, courage, and happiness by 
Rainy Brain, Sunny Brain: how to retrain your brain to overcome pessimism and achieve a more positive outlook by 