Well the popular options include RK Bali and another one by V Krishnan published by Himalayan Books
Both are available at the English Book store
The RK Bali book was last updated in 2012 . I am not sure if there is a 2013 edition .
Dont forget that the syllabus includes Human Performance and Operational procedures as well .
Syllabus is given in my above post
More or less the same as an EASA / JAA syllabus . Questions too are copied from either the RK bali book or the JAA question bank
P.S You dont need to give the ATPL Regs exam if you already hold an Indian DGCA CPL since the syllabus is the same for both .