Brisbois, Michael J. (2005). Tolkien's Imaginary Nature: An Analysis of the Structure of Middle-earth. Tolkien Studies. Project Muse. 2 (1): 197—216. doi:10.1353/tks.2005.0009. ISSN1547-3163.
Habermann, Ina; Kuhn, Nikolaus (2011). Sustainable Fictions – Geographical, Literary and Cultural Intersections in J. R. R. Tolkien'sThe Lord of the Rings. The Cartographic Journal. 48 (4): 263—273. doi:10.1179/1743277411y.0000000024. ISSN0008-7041.
Brisbois, Michael J. (2005). Tolkien's Imaginary Nature: An Analysis of the Structure of Middle-earth. Tolkien Studies. Project Muse. 2 (1): 197—216. doi:10.1353/tks.2005.0009. ISSN1547-3163.
Habermann, Ina; Kuhn, Nikolaus (2011). Sustainable Fictions – Geographical, Literary and Cultural Intersections in J. R. R. Tolkien'sThe Lord of the Rings. The Cartographic Journal. 48 (4): 263—273. doi:10.1179/1743277411y.0000000024. ISSN0008-7041.