Unfortunately there doesn't seem to be much useful information in print about roasting.
Probat recently published a roasting book, but frankly, it doesn't provide info that can be put to use in day-to-day roasting.
Sivetz wrote a 115-page document about roasting called "coffee quality". you can buy it at http://www.sivetzcoffee.com/equip.htm
I read it perhaps 12 years ago but remember it being interesting and somwhat useful.
Illy's espresso book has a short chapter on roasting but there are some very interesting nuggets there. Again, a little hard to apply in practice, but solid info.
The trouble is it is very difficult to put out a useful, practical book about roasting. But when you're ready to get into roasting, give me a call