Asked and answered: I cited the specific book that referenced it, among others.

You just waved a few titles around without actually citing evidence.

Evidence is when you type out directly the material you're talking about, followed by the source you got it from, the page(s) and paragraph(s).

You want an example of what actual quality citations look like please take a brief moment to read through some of the citations in this post

Edit: user I was replying to says they cited multiple sources. Just wanted to say they only cited one author - who's more a story-teller than a historian - while handwaving about "many authors saying it's true" without listing anyone. They completely rely on hearsay and vibes for evidence and not concrete source material for their worldview.