I wonder if there are authors like this with a reasonable number of research references at the end of their books (such as the last 50 pages of a 300 page book)

I wonder if there are authors like this with a reasonable number of research references at the end of their books (such as the last 50 pages of a 300 page book)? If you draw a pyramid with 5 vague concepts like this, I'd want research showing why 4 or 6 isn't the right number of levels, or why levels 2 and 3 are necessarily in that order with the upper level actually having some dependence on the lower which doesn't hold for the opposite direction.