Not quite in the style of Polya, but equally insightful, is Hadamard's Psychology of Invention in the Mathematical Field, ia800304.us.archive.org/4/items/eassayonthepsych006281mbp/…

Shimura wrote: "Though he was by no means the sloppy type, he was gifted with the special capability of making many mistakes, mostly in the right direction. I envied him for this, and tried in vain to imitate him, but found it quite difficult to make good mistakes."

This quotation can be found in print (with slightly different wording and punctuation) in Shimura's obituary of Taniyama in the Bull. London Math. Soc., March 1989, p. 190.

These are about to be published: bookstore.ams.org/ctm-1

@Ovi One modern book that I like is E. B. Vinberg's A Course In Algebra, published by the American Mathematical Society in 2003.

@Michael, thanks, I've made the correction.

I would guess that two of the names are Dehn and Nielsen.