jad,
There is some material available online -
Alateen Literature
The site also has a page for purchasing 'approved literature' (mostly useful and inexpensive $0.25 pamphlets).
And his school or the local alanon groups may have some of these pamphlets.
I don't know your situation well, but you could ask another adult that he respects (teacher, uncle, coach) to talk to him. Sometimes it takes a word from a 3rd party to get the message across.
I hope this helps.