The best book i have ever read about this opening is The ultimate KIA, by Angus Dunnington.
Released in 1998 but theory didnt change much and more important, the ideas are very well explained.
https://www.amazon.com/Ultimate-Kings-Indian-Attack/dp/0713482222/ref=sr_1_4?ie=UTF8&qid=1467666855&sr=8-4&keywords=king+indian+attack
Whats the main line?
I don't know what to do after reach it.
Good books about it are welcome
Thanks everybody!