From a technical analysis perspective, I think the best book I've ever purchased is
Bollinger on Bollinger Bands by John Bollinger. It's 228 pages covers a number of
interesting concepts. It does indeed cover the concept for which
Bollinger is famous:
the volatility indicating Bollinger Bands. Since signals typically require corroborating
evidence, he makes use of Arthur A. Merrill's Five Point Patterns as well as a number of
different volume indicators.
Bollinger Bands can be used in Contrarian Trading as well as in Trading with the Trends.
The hard part of found is figuring out when to transition from one to the other. Contrarian
Trading means taking an opposing position when one of the band limits has been reached. It
is at this critical decision point when you have to decide to keep the position and see if
the trade is going to 'walk the band' (Trade the Trend), or if indeed, it will reverse
direction. This is where various other indicators such as MACD, Candles, and Volume can
help trip the appropriate trigger.
Having introduced his various indicators, Bollinger then proceeds to describe some
trading strategies such as The Squeeze, Trend Following, and Reversals.
I've found that Bollinger bands help delineate any type price data, whether it be daily
bars, 1 minute bars, trades, or even quotes. I've used quite a number of different
indicators, but the ones that frequent my charts the most are Bollinger Bands.