Top 15 People Who Mysteriously Disappeared without a Trace sources
http://mysteriousuniverse.org/2016/10/weird-cases-of-families-that-vanished-without-a-trace/
https://www.mnn.com/lifestyle/arts-culture/stories/15-famous-people-who-mysteriously-disappeared
http://www.bostonmagazine.com/news/article/2014/01/28/maura-murray/
http://crimefeed.com/2016/03/10-people-missing-10-years/
http://edition.cnn.com/2009/CRIME/12/14/coldcase.florida.baby/
http://www.cracked.com/article_19765_the-5-creepiest-disappearances-that-nobody-can-explain.html
http://oddrandomthoughts.com/mysterious-disappearances-people-vanish-without-a-trace/
https://www.outsideonline.com/2164446/leave-no-trace
https://en.wikipedia.org/wiki/Disappearance_of_Asha_Degree
http://www.wcnc.com/news/local/after-15-years-family-keeps-searching-for-asha-degree/213286862
https://blogs.ancestry.com/cm/without-a-trace-4-famous-missing-corpses/
https://en.wikipedia.org/wiki/Jimmy_Hoffa
http://www.dailystar.co.uk/news/latest-news/517400/maddie-mccann-ben-needham-missing-people-uk-charlene-downes-kevin-hicks-damien-nettles
http://www.stuff.co.nz/national/91311040/without-a-trace-new-zealands-most-enduring-missing-persons-cases
http://www.mirror.co.uk/news/world-news/mysterious-case-pretty-teenage-girl-9710648
http://www.urbanghostsmedia.com/2015/10/famous-people-who-vanished-without-trace/
http://www.nbcnews.com/news/us-news/amelia-earhart-may-have-survived-crash-landing-never-seen-photo-n779591
https://en.wikipedia.org/wiki/Laozi
https://en.wikipedia.org/wiki/List_of_people_who_disappeared_mysteriously