Currently Being ModeratedJan 14, 2013 3:51 PM (in response to Titouan)
Basically you need to find a DVD reader that will work, since the only legitimate way to install Snow Leopard is with its DVD.
That can be another Mac, with which you could use FireWire Disk Mode to install Snow Leopard on your MacBook.
You do not need to upgrade to Lion first. You may upgrade from Snow Leopard directly to Mountain Lion.