| American Heritage Dictionary | Webster's Dictionary | |
| Dictionary.Com | OneLook.com | |
| Other Dictionaries | Oxford Reference Online | |
| Oxford English Dictionary (OED) |
| Oxford Reference Online | Biography.com | |
| Groliers | Columbia Encyclopedia | |
| Encyberpedia | Other Encyclopedias | |
| Britannica Online |
| Oxford Reference Online | ||
| Internet Public Library Reference | Martindale's |
| Infoplease | City and County Databook | |
| Old Farmer's Almanac | American Factfinder |