I have bought a couple of yixing teapots from ebay, and they pour well, but from the few posts I've read here, I now know that they're not really yixing because their price was so low (under 50). And that's fine for now, but in the long run I'd like to learn about real yixing teapots.
So, is there a good (comprehensive) book on yixing teapots that I should start with? My limited fund doesn't allow me to buy every book I see on Amazon, nor do the bookstores around me have much on teapots.
Any suggestions would be much appreciated

Another question, if I may, is: how can I tell from the shape of the spout whether a teapot would pour well? Should it be long and slender, and should the lower half protrude a little more than the upper half ?
Thanks, guys!
