There is a lot to love about the Gale Virtual Reference Library. If you help students of any age, make sure this resource is one of your demos when you highlight the Online Library.
There was, of course, a time when students could get the books they needed only when the library building was open. Not so anymore. This collection of full-text online reference books is a near 5,000 title home library for anyone with a library card and internet access.
Students can read, listen to, search, download, send, and cite every book in the collection, 24 hours a day. To the delight of parents and teachers and (possibly) to the disappointment of some students, GVRL means there is no longer an excuse for not being able to finish homework. The books come to you. What’s not to love?
Information Services @ Sno-Isle 
This has been my favorite database for years. Even as a college student I was extolling the virtues of GVRL. It is my go to source for basic information and starting points, and was present in the Works Cites and Reference Lists on almost all of my papers and presentations.
Thanks for sharing Zandra!