Barack Obama's remarks at Young African Leaders Initiative Town Hall at the White House in Washington, D.C., obamawhitehouse.archives.gov. June 29, 2013.
Robert Hunter, David G. Dodd (2005). “The Complete Annotated Grateful Dead Lyrics: The Collected Lyrics of Robert Hunter and John Barlow, Lyrics to All Original Songs, with Selected Traditional and Cover Songs”, p.126, Simon and Schuster