APA (7th ed.) Citation

Tolkien, J. R. R. (2023). The letters of J.R.R. Tolkien: A selection (Revised and expanded edition.). HarperCollins Publishers.

Chicago Style (17th ed.) Citation

Tolkien, J. R. R. The Letters of J.R.R. Tolkien: A Selection. Revised and expanded edition. London: HarperCollins Publishers, 2023.

MLA (9th ed.) Citation

Tolkien, J. R. R. The Letters of J.R.R. Tolkien: A Selection. Revised and expanded edition. HarperCollins Publishers, 2023.