Encyclopedia Americana: Whig Party: History of the 19th-century party.
The American Whig Party: A short history of America's second major party in the period 1834-1856.
The American Whig Review: Contents of issues from 1845-1852 of the monthly Whig journal of politics, literature, arts and science. Reproduced online courtesy of Cornell University's Making of America collection.
The New Whig Party: Information about the early 19th Century's most colorful political party, a quiz, and a self test to see if you are a Whig.
Whig Party (United States): Encyclopedia article for teens. Has pictures of same famous Whigs, and a bibliography.