To Use or Not to Use?

My professor says I can't use web sources for my paper. Ask your professor to clarify this, because there are basically two 'webs:' the 'public web' with sites search engines find, and the 'invisible web' which includes databases accessible on the web but typically only available to a library's users off their web page.

GO	with the strengths of the public web
STOP	and go back to web-based library resources