Two books - and I can't remember the title of either of them.
1. It was many years back now when I was in the Quakers for a while. I got used to the idea of a church/meeting having a selection of books to borrow and one of them was archetypical for them - both sides of the argument as to whether to take recreational drugs or no. As I recall - the book got divided exactly 50/50 into arguments for and against. Yep...the "for" bit did go into possible pleasant and/or learning experiences from it, etc. But the "anti" bit hit home as to the downside of doing so and that was my decision made on the spot. That being that I'd never try drugs - even though it would be a shame to miss out on the plus side (interesting "trips", etc).
2. There were two books of a bit later era on assertiveness training for women. Those books and a couple of courses on this were very useful at getting the message over that there are different ways to handle situations, ie get walked over, be assertive, do the walking over and the middle one is the appropriate one to use (ie don't tread on or be the one trodden on). The "broken record" technique advocated has been SO useful - ie repeating the same sentence umpteen times until it sinks into the other persons head you really mean it and stop trying for whatever they're after from you. That proved very useful when I'd got a man in my place that was being very "persistent" (if you get my drift) and I must have repeated "I don't want to" about 10-12 times in a constant row before he stopped/moved back/looked puzzled and left.
That "broken record" was also very useful with the neighbours of my current house. They got up to all sorts and the main problem was their frequent trespassing in my garden (eg the last owner of my house had obviously been walked over at regular intervals by next door neighbour and allowed her to park in my front garden). Generally there was a lot of trespassing from the several other houses involved here. "Get out of my garden" had to be said a LOT until the message sank in and there was an instance where next door neighbour and some of her buddies were all in a group in my front garden and I had to stand there and repeat that sentence quite a few times in a row before they did "contemptuous look and laughing" - but got out of my garden. Boy were those books ever useful - having a technique I could use, rather than having them (and others in different contexts) walk over me.