Caso Donald Shrum: O Mistério Americano Que Lembra a Serra do Roncador

https://www.donnersummithistoricalsociety.org/pages/bookreviews/AliensintheForest.html

https://brohiopodcast.com/the-cisco-grove-robot-alien-encounter/

https://www.tvi.show/nexus/the-cisco-grove-ufo-incident-don-shrums-1964-alien-encounter-in-tahoe-national-forest

https://www.terra.com.br/vida-e-estilo/turismo/serra/serra-do-roncador-misterios-e-aventuras-em-um-cenario-lindo,10087c5164337310VgnCLD100000bbcceb0aRCRD.html

https://radarovni.com.br/wiki/dicionario-ufologico/tempo-perdido/

https://pt.wikipedia.org/wiki/Paradoxo_verde

https://www.bbc.com/portuguese/brasil-40784488

https://pt.wikipedia.org/wiki/Encontro_de_Kelly-Hopkinsville

https://www.bbc.com/portuguese/articles/c2v8ylpgee9o

https://aventurasnahistoria.com.br/noticias/reportagem/percy-fawcett-o-eterno-explorador-em-busca-da-cidade-perdida-de-z.phtml