Wikipedia- http://en.wikipedia.org/wiki/Frederick_douglass
Iowa AEA Online- http://www.school.eb.com/elementary/article?articleId=353063&query=Frederick%20Douglass&ct=
World Book- Page 313-314
Iowa AEA Online- http://www.school.eb.com/elementary/article?articleId=353063&query=Frederick%20Douglass&ct=
World Book- Page 313-314