This is a powerful account of the author's experiences as a concentration camp prisoner during World War II and how he developed his philosophy of finding meaning in suffering.
"The 7 Habits of Highly Effective People" by Stephen R. Covey
"Mindset: The New Psychology of Success" by Carol Dweck
"The Power of Now: A Guide to Spiritual Enlightenment" by Eckhart Tolle
"The Lean Startup: How Today’s Entrepreneurs Use Continuous Innovation to Create Radically Successful Businesses" by Eric Ries.