The authors are PhDs in Astronomy (Ross) and Biology (Razale). If you scroll down below the list, you'll find 226 reputable references.
You're steadfastly opposed to my post, but I still maintain you're still just scratching the surface. Let me recommend Dr. Ross' and Dr. Razale's books. If you read them and still object, then you can take it up with them.
Best wishes.
I only read over material from Hugh Ross, the astrophysicist. Based on his bio, Dr. Ross thinks he sees the imprints of God, and is a Christian first and foremost. Gazing at the universe through that prism is fine with me if it makes him happy, but it does rather little to commend his scientific reason and objective judgment so far as I'm concerned. His "unshakable confidence that God's revelation of Himself in Scripture and nature do not, will not, and cannot contradict" obviously drives his mental exercise to reconcile the two. He may be better off for that, but the scientific merit of his hypotheses are clearly not as a result.
PS. There is no reason for me to bother reading their books because there is nothing down this line of reasoning that would induce me to change my view in this regard. At most, they would reinforce a view that I already tend toward: that civilizations are rare. I have no problem with even the notion that we are one of a handful of sentient beings in the universe, although I would guess there are tens of billions (just one on average per spiral galaxy very similar to ours would give that result).