Forbidden Legend - The Elder Scrolls V: Skyrim Wiki Guide - IGN
Skyrim - Folgunthur Puzzles - YouTube
Monthly Modder: Dafydd1
Puzzle Variations at Skyrim Nexus - Mods and Community
Skyrim Walkthrough: Ep. 57 "Forbidden Legend" at Germund's Hall (Gauldur Amulet Fragment) - video Dailymotion
This is the only canon puzzle (Dragonborn DLC - Kolbjorn Barrow) that's so obscure that I doubt the vast majority of players have solved without Google : r/skyrim
How do I get past the four switches in Folgunthur? - The Elder Scrolls V: Skyrim
SKYRIM] Puzzle Guide - Folgunthur's Symbol Pillars & the Gauldur Amulet - YouTube