Go Green, Budget and Yet Keen to Study More...Better World Books

Lately,  I discovered that there is a great website where you can buy used books in good conditions and at the fraction of its original price. What a green and win-win situation...At the same time you can donate away your book to help the rest of the people who needs it....

I am learning on value investing now and keen to explore more from industry Gurus like Warren Buffett, Peter Lynch, Charlie Munger, Benjamin Graham.... Thus, books from Gurus or related to Gurus must not miss....