Marc Benford wrote on 06/20/14 at 18:08:15:
So... is it or is it not about 1. Nf3 ?
Kramnik uses 1. Nf3 for move order purposes, frequently with the intention of reaching a Catalan position. You would have to study the Khalifman book in depth to find why, but the 1. Nf3 move order gives possibilities not available from 1. .
Marc Benford wrote on 06/20/14 at 18:08:15:
And that's it. Just two books. That's all I found, for the third most popular opening. How is that possible?
If you intend the sequence 1. Nf3 c5 2. c4, that equally can arise from the English Opening, so any books covering that are also suitable. It's a very old book now, the first edition being published in 1968, but Ray Keene's Flank Openings gives a summary of what you can do after 1. Nf3 and 1. c4 where you don't just transpose to something else.
There have been a number of books over the years about the Reti and Kings Indian Attack, are they all now out of print?
What book to get might depend on how you were intending to conduct the middle game. In a Reti, White is probably playing in some order Nf3, g3, Bg2, O-O, c4, Nc3 and d3. In a Kings Indian Attack it's still Nf3, g3, Bg2, O-O and d3, but probably Nbd2 and e4. In a Colle-Zukertort, it's going to be Nf3, d4, e3, b3, Bb2. In a Nimzo-Larsen it's Nf3, b3, Bb2, e3 with Bb5 if allowed.