Most people confuse themselves between Investing and Trading. Also get carried away with hype and loose patience during bad times. This and several other situations, to which normal investor falls as a prey. Mentioned books, are the only books can be considered as Bible of investing and recommended by legendary investors such as Warren Buffet.
At 25, most people are in their early stage of career and tries to secure their future by investing. Therefore, it becomes utterly important to understand basics of investing. There are certain ground rules, which will take one long way.
Index funds were first invented in 1975 by Vanguard founder-Jack Bogle. As of today as well they are the best instruments for passive investing. They also serve as a benchmark and has outperformed individual stock performance in long run.