I agree that Kill Everyone is a fantastic book, but it's about sng's and tournaments, not cash. Yes, the newer edition does have a 6 max cash chapter, but for a cash book I'd suggest something else. The Harrington on cash books are pretty good. There's a lesser known cash book called No-Limit Texas
Hold'em - A Complete Course by Angel Largay that I think is quite good and has a few nuggets that I've not seen in any other book (and I've read 3 dozen plus of em.) If it's your first book on cash games I'd recommend the Harington on Cash books though. They are a very good starting point.