#1 The OWL at Purdue

#2 University of Houston, Victoria

#3 Encyclopedia Britannica

#4 Internet Public Library (IPL)

#5 Internet Archive

#6 The Ref Desk

#7 Westfield State College Ely Library

#8 Bartleby

#9 U.S. Census Bureau

#10 Modern Language Association

via degreedirectory.org