Replying to NS need some serious help here (not a contest sway)

Alright so for my senior year we have to do a 10 page senior research paper.  I chose my topic on the progression of freestlye skiing.  I have some web sites but not a lot.  So my teacher told me if I  don't get some more sites then I have to change my topic.  I asked about NS but he said that using an online bloggers opinion is not a reliable source.  And Wikipidia he said is not good enough because people can edit it.  So this is where you NS can come intp play and help a brother out.  I need some good reliable websites that can help me write a peper with good info on the progression of freestyle skiing.  thanks NS.