Personally recommend the following books in regards to Elliott Wave theory (available until Mar 23 2018)...

1. Elliott Wave Principle: Key to Market Behavior
    Robert R. Prechter, A.J. Frost
    https://files.fm/u/pnmaksvv (77MB)

2. Visual Guide to Elliott Wave Trading (Bloomberg Financial)
    Wayne Gorman, Jeffrey Kennedy
    https://files.fm/u/mcg8me4m (33MB)

Start with the second book since it provides a visual introduction to illustrating the use of Fibonacci concepts.