I agree with the imperial library despite that last part, their articles seem to be acknowledged as credible by most people. Link: Imperial Library
Asking one of our resident lore masters might also be a worth while venture
I meant, that I don't consider them canon. For me the canon are the sources from TES games and official novels like Infernal City. The articles in the Imperial library certainly present wonderful and creative theories, but they are just that - theories (I especially like the connection between giants and Nords). Kirkbride even delves in sci-fi sometimes