http://www.u-s-history.com/pages/h255.html
http://www.monroedoctrine.net/
http://history.state.gov/milestones/1801-1829/monroe
http://www.loc.gov/rr/program/bib/ourdocs/monroe.html
http://www.thenagain.info/webchron/usa/mondoc.html
http://www.ourdocuments.gov/doc-php?flash=true+doc=23