http://en.wikipedia.org/wiki/Reference
Site
http://www.reference.com/
Word
http://www.wordreference.com/
Desk
http://www.refdesk.com/
Tube
https://www.youtube.com/results?search_query=Reference
Slides
http://www.slideshare.net/search/slideshow?searchfrom=header&q=Reference
Me
https://www.refme.com
Work
https://www.refworks.com
Seek
https://www.refseek.com/
Site
http://www.reference.com/
Word
http://www.wordreference.com/
Desk
http://www.refdesk.com/
Tube
https://www.youtube.com/results?search_query=Reference
Slides
http://www.slideshare.net/search/slideshow?searchfrom=header&q=Reference
Me
https://www.refme.com
Work
https://www.refworks.com
Seek
https://www.refseek.com/