15 Most Popular Reference Websites

1) Wikipedia
Alexa Rank - 6
Google Page Rank - 9/10

2) Yahoo Answers
Alexa Rank - N/A
Google Page Rank - 7/10

3) About
Alexa Rank - 85
Google Page Rank - 9/10

4) Reference.com
Alexa Rank - 182
Google Page Rank - 8/10

5) Answers
Alexa Rank - 233
Google Page Rank - 8/10

6)eHow
Alexa Rank - 269
Google Page Rank - 7/10

7) Wikia
Alexa Rank - 141
Google Page Rank - 6/10

8) Wiki How
Alexa Rank - 167
Google Page Rank - 6/10

9) HubPages
Alexa Rank - 535
Google Page Rank - 6/10

10) Squidoo
Alexa Rank - 645
Google Page Rank - 7/10

11) Google Books
Alexa Rank - N/A
Google Page Rank - 9/10

12) Howstuffworks
Alexa Rank - 663 
Google Page Rank - 8/10

13) StackExchange
Alexa Rank - 245
Google Page Rank - 6/10

14) Internet Archive
Alexa Rank - 170
Google Page Rank - 6/10

15) Ezine Articles
Alexa Rank - 650
Google Page Rank - 6/10