intelligent investor - http://www.amazon.com/Intelligent-Investor-Definitive-Investing-Practical/dp/0060555661
common stock uncommon profits - http://www.amazon.com/Uncommon-Profits-Writings-Investment-Classics/dp/0471445509/ref=sr_1_1?s=books&ie=UTF8&qid=1348868376&sr=1-1&keywords=common+stock+uncommon+profits
buffettology - http://www.amazon.com/Buffettology-Previously-Unexplained-Techniques-Buffett/dp/068484821X/ref=sr_1_1?s=books&ie=UTF8&qid=1348868386&sr=1-1&keywords=buffettology
buffett's annual letters to shareholders - http://www.amazon.com/Essays-Warren-Buffett-Lessons-Corporate/dp/0966446127/ref=sr_1_1?s=books&ie=UTF8&qid=1348868399&sr=1-1&keywords=buffett%27s+annual+letters+to+shareholders