As Dale Carnegie said:

"Even in such technical lines as engineering, about 15% of one's [financial] success is due one's technical knowledge and about 85% is due to skill in human engineering, to personality and the ability to lead people."

In this sense a few books about mastering that 85%:

http://www.amazon.com/How-Found-Freedom-Unfree-World-ebook/d...

http://www.amazon.com/48-Laws-Power-Robert-Greene/dp/0140280...

http://www.amazon.com/How-Win-Friends-Influence-People/dp/06...

http://www.amazon.com/Long-Walk-Freedom-Autobiography-Mandel...

I would recommend anyone interested in his life to read his autobiography, Long Walk to Freedom. http://www.amazon.ca/Long-Walk-Freedom-Autobiography-Mandela...