@tony5732,
Intellectual integrity has to include putting in no small effort to understand a thing as fully as possible (given one's life constraints), open mindedness and honesty.
How one establishes sources which are or are not examples of the above is a matter of experience. Do they try to get it right? Do they admit error? Does prior work stand up?
As to who I think matches these criteria, if I post them here, then I consider them (or the person) dependable. Not an absolute but a high probability.