Best how-to book for aspiring young whitewater kayaker

Hello folks. I am an experienced rafter and we do 15-20 river days per year with our kids and friends. My daughter is 14 and wants to get into whitewater kayaking, so she bought a nice used whitewater boat, paddle etc. For background, she is very careful but loves water and is generally fearless in this regard (she plays water polo if you know what that is like). Last summer she took our inflatable kayak down the entire main salmon including all class IVs, down Westwater (i let her do...

Best how-to book for aspiring young whitewater kayaker