There are lots of ‘references’ I take as interesting, but never conclusive; and a lot I don’t believe at all.
I know there is a LOT of mindless assumption and even downright trickery in this subject; and a lot of money and other benefits in promoting it - traditionally in publishing, and now even more on the Internet.
And even when people are not ‘on the make’, a lot of them are very credulous.
Folks do not get rich on the UFO subject—if you have met many of the “players” and actually talked to them you would know that.
Almost all researchers do so on a shoestring and pursue the topic because of a passion for it.
Even the frauds and fakers don’t make much money.
;-)