Medieval Illuminators and Their methods of work
by Jonathan J.G. Alexander
if you cut and paste the title or the author into one of the amazon search link on the side bar to the right you should find it.
In .at and .de it comes up as out of print and rare costing 130, something euros but from .com you can still buy it new for 37.- dollars US. + shipping.
It's a fabulous book, every scribe aught to have a copy.