Reference request for practicing integration I'm looking for a reference -- of any kind, website or book -- for practicing integration techniques. The only book I have on hand is Stewart's calculus book, but that's not quite what I'm looking for.
I need something with a lot of different types of problems; problems on the challenging side -- in the sense that they involve some clever use of a common technique, or use of a lesser known technique, for example. With that said, I'll most definitely need an accompanying solutions manual.
I have some exposure in analysis at the level of baby Rudin, so more advanced references are welcome as well.
Note:  I did do a  search and found this post (Zwillinger), but didn't find much else. 
 A: The text you refer to is indeed well worth the cost.  But for the sake of easing the strain on the "pocket-book", I'd suggest the relatively inexpensive books in the Schaum's Outline series: e.g. Calculus, or their 3000 Solved Problems in Calculus. Their series of outlines usually serve as a good quick references, but also as a great "work-books" full of exercises and solutions.  You may want to search to see if they have one exclusively with respect to integration.
A: For finding the integration and its techniques good, I have suggested my students to be master in the following book: 

Problems In Calculus Of One Variable by Issak Maron

May be it is an old one respect to what you have been suggested, but I strongly recommend you. Try it. :-)
A: These international editions also have a ton of practice problems regarding Calculus:
Thomas and Finney Calculus ( I got 9th edition, but there is probably a newer one)
Edwards and Penney Calculus with Analytic geometry
I got these books and I practiced the #%$@ out of them. Still use them for reference once in a while. Truth is though, that Stewart is a pretty good Calc book to study from, but you are right, when it comes to challenge problems, it's limited.
