Unconditional Parenting

Interesting perspective on parenting. Probably a bit too extreme, a bit too preachy, and the author spends far too much time on the “wrong” practices, and far too little on what “good” parenting actually looks like, but definitely worth a read.
I would be interested to read a similarly persuasive book(s) from the “behaviourist” camp to form a more informed opinion - especially that in general I'm implicitly biased against behaviourism - any recommendations would be much appreciated!