Is it legal to download film scripts that have been uploaded onto the internet?

I've found some sites that have downloadable copies of actual film scripts (not films themsevles). The scripts and screenplays are free to download. I'm just wondering, is this illegal at all? I'm using them for research at school and was wondering if I will get in trouble, should I cite these as my resources and part of my research at all? Any help would be much appreciated.|||No its not illegal as long as you do not copy it as it would be copyrighted