Vikings in Britain. Who were they? What influences had they on British language and life? Where do their descendants live in Britain?

You must have 5 sources, 2 of them being books if possible. Quality Control: When using the internet be careful! Look at the suffix at the end of the url. Usually, .edu is good; .gov can be also but remember it could be biased. What organization in the government produced the information? Be careful of .com (stands for commercial). Be careful of personal home pages.