Beasts of Middle-earth - Tolkienology

Glaurung - Tolkien Gateway

The Depicted Size of Dragons - or Hyperbole Much? : r/tolkienfans

The Nerd of the Rings on X: Smaug and Glaurung were based on real dragons Tolkien encountered when he gained access to a secret civilization of dwarves who domesticated the creatures. Here

Who is more powerful, Glaurung or Smaug? - Quora

Glaurung - the Father of Dragons by WretchedSpawn2012

Funny LotR stuff - The odd bit of Silmarillion - Wattpad

The Children of Húrin by J. R. R. Tolkien, Alan Lee, Paperback

The Silmarillion / Tear Jerker - TV Tropes

Guide to The Silmarillion: Of the Fifth Battle: Nirnaeth Arnoediad (Ch. 20) — Tea with Tolkien

Blind Read Through: J.R.R. Tolkien; The Silmarillion, Of the Ruin of Beleriand and the Fall of Fingolfin