Another Book Recommendation Bleg.

As Heather winces and wonders where we'll put them...

I'm looking for solid works on Islam--history and theology. I'd like something that is neither soft-pedalling nor polemical, and preferably well-sourced and footnoted.

I have Geisler's Answering Islam (which is fine as far as it goes, but is mostly theological) and Trifkovic's Sword of the Prophet (which seems good but very uneven, and the footnoting is causing serious teeth-grinding).

Thanks in advance.