If you search my nick (or just go to my profile and read through my posts) you can find threads on flushing where I have posted links to all the studies I quote and all the books.
I even posted 2 links in the sticky thread on the subject of trichomes, those two links relate to the discussion of 'pre-harvest flushing'.
I assume that is what you mean when you say "non-flushing argument". We're talking about 'pre-harvest flushing'.
I get the information from the internet and from books I own.
The information I get from the internet is either from peer-reviewed scientific papers, journals, research, theses etc. or from companies who work in a medical and/or biological field (biotech etc.).
All the information is backed by science, it's written by educated scientists and is thought of as fact in the scientific community (otherwise the papers, research and theses would be disproved and thus irrelevant).