Wrong approach. Don't show them papers. They likely won't read it, it will not convince anyone.
There's no book that says riding a bike is a good thing. Or that explains riding (not the technique). You have to do it to see why- your parents presumably won't.
All that info memos about riding safety, advice on gear, books about proper riding technique, whatever, will only leave only one piece of information in the reader's mind: that riding is dangerous and should be even more so forbidden.
Take another approach:
Explain them that you
want it. That you know it's dangerous but steps can be taken to minimize the danger.
There is so much more to riding than the perceived danger- there's enjoying nature better than you'll ever do in a car, traveling, seeing other places, encountering demanding situations, feeling ones own humbleness in regard to the environment (and to yourself), maybe even meditation and contemplation and ultimately fun.
That's what riding is about.
Of course you can get this by many means. You could go hiking (which is in fact, at least in germany, on third place regarding the dangers of different recreation activities), which is maybe the closest to what I get out of riding. You might start soaring with a glider, which is maybe the closest thing to riding fast or on a racetrack.
But it's still different from riding, which is no better or worse than any of it. It's just different.
So this should be your motivation- riding itself. And if you want it nothing will keep you from doing it. Don't expect financial support from your parents, but I think they'll respect your decision if you stick to it.
However you can still show them that you actually think about safety. But don't show them papers again or explain it, show them that you mean it. When you got your bike (which is still some time to go, I guess) take a safety course first, always wear gear, show responsibility. If you take out your bicycle wear a helmet- parents will take notice of such things. If you want to play around on your bike do it in a safe place- a racetrack or confined places (don't choose the walmart parking lot) will do. You can of course have fun stunting too- if you're into this why not? Look at Kane1. Just wear your gear and show responsibility. Choose a safe place to practice- safe for you, safe for other people.