These 2 books, one in B/W and one in Color can teach you a lesson or two. Steve McCurry and his South SouthEast from Phaidon publishing is a portfolio of some of his best work. For me this is pure photography the way it should look like. Sebastiao Salgados book from Aperture taught me that a "project" is something you should do with love and respect. Take your time and do it good. Can't be much better than this if you ask me.