1. How to make money in stocks (By William O'Neil), this is the bible of technical anlaysis and stock invesetment, read it 10+ times.
2. Reminiscences of a Stock Operator (By Edwin Lefevre), this is the biography of legendary Jesse Livermore.
3. How I Made $2 Million in the Stock Market (By Nicolas Darvas), quite fun and easy to read.
4. Encyclopedia of Chart Patterns (By Thomas Bulkowski), use this as a reference for chart patterns.