Wikipedia:Simple sources

So, you decided you want to find a source for some Wikipedia fact. You can find it online, or you can find it in print. Here is a place to begin listing some easily accessible reference books and websites that will have basic information. Please add as you see fit. These books should be accessible in most major libraries.

General

 * OAIster reference search &mdash; searches vast online and scanned collections from educational institutions. Currently: 6,073,500 records from 572 institutions
 * Library of Congress American Memory Collection &mdash; large collection of public domain information, mainly related to the United States
 * Library of Congress Country Studies &mdash; thorough and detailed public domain references written by the research staff of the Library of Congress

Political History

 * Harris M. Lentz III, Heads of States and Governments: A Worldwide Encyclopedia of Over 2,300 Leaders, 1945 through 1992. McFarland & Company, Inc., 1994. ISBN 0899509266.