I had previously posted the following books as resources in regards to the "whys" and "hows" in creating corporate identity manuals. A couple of them are out of print ,but copies might be found at used book resources like ebay, half.com, powells.com, tatteredcover.com, abe.com, etc. or in libraries.
Corporate Identity Manuals (1976), by David E. Carter
Designing Corporate Identity Programs for Small Corporations, by David
E. Carter
Designing Corporate Identity : Graphic Design As a Business Strategy, by Pat Matson Knapp
– Jeff
Jeff Fisher
Engineer of Creative Identity
Jeff Fisher LogoMotives
http://www.jfisherlogomotives.com