http://www.amazon.com/gp/product/0136106811/
It's pretty expensive as far as books go, but very much worth it. It not only explains how to set a price, but also how to set different prices across segments, how to calculate/estimate value your product is worth to your customers, how to price differently over time (honoring the changing business cycle) and how to react to competition (a very short summary: add value, target more segments, don't go into a price war and instead force the others out of it by restructuring your offer or by adding "threats" ("we'll match the best price" etc.)).