http://www.val-znanje.com/index.php?option=com_content&view=article&id=1222:nikola-tesla-o-21-stoljecu-1937g-i-naucni-komentari&catid=37:tekstovi&Itemid=172 VLADIMIR KARADZIC PODGORICA 2012
http://www.val-znanje.com/index.php?option=com_content&view=article&id=1222:nikola-tesla-o-21-stoljecu-1937g-i-naucni-komentari&catid=37:tekstovi&Itemid=172 VLADIMIR KARADZIC PODGORICA 2012