Finding Info on Jericho

I am writing my LAST college paper (until I decide to go back for my Masters). I chose to write on archaeological evidence for Jericho, but it seems most sources cost money to obtain. Never before have I had such trouble researching a paper online. Perhaps I could go to a library, except the only time I have to work on this is after 9:00 at night when David goes to bed. I suppose the best thing to do is make up sources - just kidding. I will do the best I can with the limited sources I have.