I was having trouble finding some specific in-game books. So I thought I'd ask here.
But then I decided I'll try to make this topic more useful instead and have it being a general book finding topic for anyone to use.

So, does anyone know where I can find "Modern Heretics"? I was hoping it'd help me find the other Daedric Shrines I haven't found yet. Also, I'm also having trouble finding "The Argonian Account" numbers three and four; and if anyone has the location of some of the atronach forge recipes, I'd be really grateful.

My book-collector found The Argonian Account books 2 and 4 at the Thalmor embassy. Only copies found. I found 1 and 3 to be pretty common. Did you mean 2 and 4?

I've only found 1 forge recipe, and it was randomly placed in an enemy mage's inventory. Seems to be an extremely rare random placement.

This is all moot anyway, since you can locate any of this by searching http://www.uesp.net/wiki/Skyrim:Skyrim