Reddit reviews Controller-Based Wireless LAN Fundamentals: An end-to-end reference guide to design, deploy, manage, and secure 802.11 wireless networks
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Cisco Wireless LAN Controller Configuration Guide, Release 7.0 - it's only a 28MB PDF ;)
I found this on Amazon which may be more digestable: Controller-Based Wireless LAN Fundamentals
I normally refer to the configuration guide as needed, I learned most of my wireless stuff the hard way.
EDIT: If you do find books on the subject, make sure you check the versions covered. There are significant differences between 4, 5, 6, and 7, to the point where some major features are completely missing or moved. Also, if you're using anything below 7 then you're going to have a bad time.