========= *RICERCA AGGIORNATA AL 16/01/2020*
Wikipedia_talk_list/Dr._Karla_Turner
http://www.ufoabduction.com/links.htm
https://web.archive.org/web/20120415033250/http://www.intrudersfoundation.org/inside.html
https://www.silverland.info/ufo-s-people/budd-hopkins/
http://www.contactwithspace-ea.com/arthra/PRobbins.html
http://ufomedia.blogspot.com/2007/11/intruders-foundation.html