You might find the relevant section of the AskHistorians booklist useful. Although already very decent it is also in the process of being overhauled by the flavored users however, and so you might want to return in a few weeks time, just in case some new and interesting titles have been added by then.

As for overall introductions to the topic, the works of Howard, Strachan, and Keegan mentioned in the above list are still among the best starting points available.