The most cited English-language book is The Thirty Years' War: Europe's Tragedy by Peter Wilson. To this recommendation I would add The Thirty Years' War by Geoffrey Parker. These two books are highly complimentary, for such a complex topic.

For more advanced reading, I like Cramer's The Thirty Years' War and German Memory in the 19th Century, which covers a lot of the historiography. And also Mortimer's Eyewitness Accounts of the Thirty Years War, which is a very interesting read but should not be read out of context. Both discuss the use of sources and the difficulties in assessing whether or how much they are biased.