Favorite source books and reading order?

I've read the Core book and a couple of others (I loved Ancient Magic btw). But it seems like all the books refer to one another, so I'm not sure what order to read them in. Is there a list somewhere?

Also, which are your favorite source books (not including the core book of course)?

Books tend to refer mostly to already published books, so if you want to avoid references to things you hadn’t read you could go chronologically.

As for favorite books, priorities and such, not so long ago avenger314 addressed that here,