I believe the best source is one that takes you directly to the information. The word Archives does not do that. If a hyperlink isn't possible then direction to the information should be included, example : Location Archive of Where ever <ref> mc 310 ms 40/2 </ref> this gives direction to the collection and file. Another thing about sources, if at all possible, I think , should be the original source, headstone, Birth , death, marriage or funeral/obituary record. They are stored in Archives but can be linked to/seen by anyone. Sites that require paid membership are not available to everyone, linking to those sites instead of the original site, limits viewing power to those who choose this site, a free site. State and Provincial sites remain, their information remains, while Internet sites come and go, genealogy sites, come and go as sites are discontinued, sold or moved. These are just my thought on sourcing.