OK not quite a book But
I though I'd point out 'Collect it!' magazine -available form your local WH Smiths - has, amongst other, things started focussing much more on Glass (and Pottery).
They are doing quite a few glass articles each month. In the next few months I've doing/done articles for them covering
Tiffany -October issue out September 10th
Bohemian Stem Glasses -November Issue
Enamelled Stuart -January Issue
Galle -February Issue