R.K.
It depends upon the child. My #3 a daughter wanted to be a part of the school elite and intellectually she met the qualification. She was doing college level algebra in 4th grade. But being a part of that group meant that their clothes came from Holister or Ambrocrombie or Aeropostle all way over priced and in my opinion cheeply made. But the cool kids wouldn't let her be in that group (even though she was on the dance team) unless she had the right clothes. She had to work to pay for them and babysat a lot.
Then when they get into middle school and are changing for PE class you find another form or harressment. The girls all want or need the cute bras and matching panties or thongs not because they want the boys to see them --- it's so some loud mouthed bratty girl doesn't yell across the lunchroom here comes Patty she wears grannie panties and bras.
I know it's stupid and they outgrow it usually in high school or right after high school. But it would have been like wearing a crew cut or bobby socks in 1967 -- the year of the Summer of Love. You just weren't cool maaaan--peace.
It depends upon the peer pressure. If it's pressure to join a gang or tag or other vandelism or theft or drinking or drugs it's not easy to go against the peer group. It's the time when you have to have a strong enough bond with you child that they know they can come to you and talk about anything and you won't jump the gun and start yelling. Hey dad, Tommy and Bobby are having a party and Jimmy is bringing the pot and Susie is bringing the beer can I go? Ahhh no honey you can't and this is why.... (calmly)
Several years ago my son got caught stealing, the neighbor kids told him if he didn't do it they would beat him up. He got caught and the the police were at my door. I just looked at him and said why didn't you come and get me? He said he was to scared. I said yell through the window Mom I need you!!!! They were standing only about 10 feet from my window. Anyway I would have handled it. I am a Black Belt in Tae Kwon Do, I could have handled a couple of middle school kids scaring my son--without hitting them. And I would have taken him in the house and called the police and reported them to the police. But he crashed to peer presure. Even though he had seen me through my training to Black Belt--he didn't equate it to hey Mom can kick some serious @$$ because I have always been a gentle person.
Kids shoplift because 'everybody does it'. UMMM no not everybody because I don't and neither do you.
No books just a lot of talk between them and you and teaching right from wrong and the strength to stand up to bullies.