Classic Schwinn Bicycles -- William Love -- ISBN # 0-7603-1563-9
Schwinn Bicycles -- Jay Pridmore & Jim Hurd --ISBN # 0-7603-1298-2
The American Bicycle -- Jay Pridmore & Jim Hurd -- ISBN # 0-7603-1045-9
I know there's at least a couple of other books out there, but these are what I currently have in my library.
-Mp