Athrabeth

Tolkien, J. R. R. The Treason of Isendgard. Ed. Christopher Tolkien. The History of Middle-earth: Vol. 7. HarperCollins, London, 1989.

Tolkien, J. R. R. The War of the Ring. Ed. Christopher Tolkien. The History of Middle-earth: Vol. 8. HarperCollins, London, 1990.

Tolkien, J. R. R. The Peoples of Middle-earth. Ed. Christopher Tolkien. The History of Middle-earth: Vol. 09. HarperCollins, London, 1992.

Tolkien, J. R. R. The Peoples of Middle-earth. Ed. Christopher Tolkien. The History of Middle-earth: Vol. 12. HarperCollins, London, 1996.

Letters of J.R.R. Tolkien. Ed. Humphrey Carpenter with Christopher Tolkien. HarperCollinsPublishers Ltd, London. Apple Books Edition. Ebook Edition © 2012

Tolkien, J. R. R. The Silmarillion. Edited by Christopher Tolkien. Houghton Mifflin Harcourt. Apple Books edition. 

Tolkien, J. R. R. The Lord of the Rings. HarperCollins e-books. Apple Books edition. Appendix A, B

Tolkien Gateway entry for “Angmar” https://tolkiengateway.net/wiki/Angmar (Accessed 9/11/22)

Tolkien Gateway entry for “Witch-king” https://tolkiengateway.net/wiki/Witch-king (Accessed 9/11/22)