Here is a list of books written by J.R.R. Tolkien
The Hobbit
The Lord of the Rings
The Fellowship of the Ring
The Two Towers
The Return of the King
The Silmarillion
Unfinished Tales
The Adeventures of Tom Bombadil
The History of Middle Earth Series
The Book of Lost Tales, Part 1
The Book of Lost Tales, Part 2
The Lays of Beleriand
The Shaping of Middle-Earth: The Quenta, The Ambarkanta and the Annals
The Lost Road and Other Writings
The Return of the Shadow: The History of the Lord of the Rings, Part One
The Treason of Isengard: The History of the Lord of the Rings, Part Two
The War of the Ring: The History of the Lord of the Rings, Part Three
Sauron Defeated: The History of the Lord of the Rings, Part Four
Morgoth's Ring: The Later Silmarillion, Part One : The Legends of Aman
The War of the Jewels: The Later Silmarillion : Part Two : The Legends of Beleriand
The Peoples of Middle-Earth