(4)
Michael Salla sent us some examples(1) of ETs who have allegedly lived amongst us, such as this image of a being from "Ummo." He has also written a study paper (html(2)/PDF(3)) about human-extraterrestrial interactions, documenting the testimonies of contactees and whistleblowers.

1. http://archive.coasttocoastam.com/gen/page2014.html?theme=light
2. http://exopoliticsjournal.com/vol-1/1-4-Salla.htm
3. http://exopoliticsjournal.com/Journal-vol-1-4-Salla.pdf
4. http://archive.coasttocoastam.com/gen/page2014.html?theme=light