Quote from MTE:
"Delta neutral" is a bit too general to give you anything meaningful. That is, most option books discuss "delta neutral".
What exactly are you looking for? The definition of delta neutral, delta neutral trading, neutralizing delta?
Quote from gkishot:
My guess is he is probably looking for the books with a detailed explanation of the advanced topics.

Quote from ozzie123:
Spot on
I'm looking for a book that discuss this topic in-depth. I already knows the basic of the subject from Fontanills and McMillan books but I'd like to dig it deeper.
Anyone?