Timothy-Ggreen Beckley has written several books on the UFO & ET phenomenon.
https://www.coasttocoastam.com/show/2021-03-21-show
https://uforeview.tripod.com/index.html
https://spectralvision.wordpress.com/2021/03/06/a-comprehensive-study-of-african-american-ufo-experiencers-the-unsung-patriots-of-ufology