Think and Grow Rich is a classic.

Written while he what on staff at the White House helping FDR keep the country from going insane during the Depression. Hill had the most of studied successful people in the country at the time: Thomas Edison, Henry Ford, William Wriggley, etc. He not only of studied them, he LIVED withthem, got to know them intimately. He Was commissioned by the richest one in the world at That Time, Andrew Carnegie, to study successful people and thesis figure out What They had in common, and to formulate it into principles anyone could use to become successful. And he did it. Think and Grow Rich is the culmination, and THOUSANDS of successful people owe Their success to this book, and they 're happy to tell you that. Some of the language is arcane, some of the Explanations are not the most scientific you've ever read, but the principles are sound. They work. It's a fun book to read, too.
Another fun book to read with substance and References is "Self-Help Stuff That Works" by Adam Khan (Youme Works; ISBN: 0962465674).