5 Go-To Sources for Good Non-Fiction Books

http://www.goodreads.com/list/show/12719.Time_Magazine_s_All_TIME_100_Best_Non_Fiction_Books

http://www.fictionawardwinners.com/nytimesbestbooks/nonfiction.cfm

http://www.modernlibrary.com/top-100/100-best-nonfiction/

http://www.listmuse.com/best-books-top-100-nonfiction.php

http://www.openculture.com/2011/06/the_25_best_non-fiction_books_ever_readers_picks.html