Well Books i do not know of any....
I will start and say that any 2 cards are good HU. Depends on how you play them and the board.
I would very rarely go all in unless i got a complete nuts in my
hands my and very good read in the other player.
In the since of reads betting patterns are key. To have a good idea what the other player may have. Pot betting over betting. Do some reading on small ball. My heads up game is based around small ball.
On the button any moderate and strong hands i would raise 3 x BB.
If somebody raises your BB and you a good hand reraise back!!
Contination bets both on the flop and turn the river, if your lucky and the players has not hit most weak players would fold on the turn.
Trying cover alot here if i think of anymore i'll let you know...
Any more question fire.....