I can recommend three:
Type 2 Diabetes - In adults of all ages
Type 2 Diabetes - Answers at your fingertips
Type 2 Diabetes - The First Year
The first two have been written by Charles Fox, a senior physician with a special interest in diabetes at Northampton General, the last book was written by Gretchen Becker.
All three discuss the types of medication available to treat diabetes. Becker's discusses (briefly) all dietary options recommended to people with diabetes, whilst Fox discusses a low GI approach.
Regards, Tubs.