The artwork needs to be within: 10-7/8” (10.875”) wide x 7-1/4” (7.25”) high.
The artwork background (overall document size) needs to be: 11-3/8” (11.375”) wide x 7-3/4” (7.75”) high. This is for the bleed.
The artwork for the spine needs to be within a 5/8”.