(1) http://www.radiomarconi.com

(2) http://www.invent.org/book/book-text/71.html

(3) http://www.marconiusa.org/

(4) http://www.ideafinder.com/history/inventors/marconi.htm

(5) http://www.pirandello.com/marconi.html

(6) http://www.pbs.org/wgbh/aso/databank/entries/btmarc.html