Today I stumbled upon this Hybrid Classes page (d20pfsrd) and since I once bought a few pathfinder source books in PDF I went to see if I already own the relevant book (I usually play liberally-houseruled versions of 3.5e).
Sadly, the only Pathfinder rule-book I own is the Core Rulebook (the others I own are guide-books, bestiaries, and adventures).
In what source books do hybrid classes appear?
What about the base classes?
Are they available as PDF? Print? Both?