Epps, Peter G. «Review of Bilbo's Journey: Discovering the Hidden Meaning of The Hobbit». Christianity and Literature, 64, 12-2014, pàg. 122–126. DOI: 10.1177/0148333114556596c. JSTOR: 26194807.
Robb, Brian J. «ch. 1 Audio Adaptations». A: Middle-earth Envisioned: The Hobbit and The Lord of the Rings: On screen, on stage, and beyond. Race Point Publishing, 2013, p. 19, 66. ISBN 978-1-937994-27-3.
Epps, Peter G. «Review of Bilbo's Journey: Discovering the Hidden Meaning of The Hobbit». Christianity and Literature, 64, 12-2014, pàg. 122–126. DOI: 10.1177/0148333114556596c. JSTOR: 26194807.