Secretary of the Senate, United States Congress.„Presidential Medal of Freedom Recipients“. Official Website of the United States Senate. United States Senate (Government of the United States). 2004-yil 14-iyulda asl nusxadan arxivlangan. Qaraldi: 2011-yil 14-noyabr.
Secretary of the Senate, United States Congress.„Presidential Medal of Freedom Recipients“. Official Website of the United States Senate. United States Senate (Government of the United States). 2004-yil 14-iyulda asl nusxadan arxivlangan. Qaraldi: 2011-yil 14-noyabr.