Brisbois, Michael J. (2005). "Tolkien's Imaginary Nature: An Analysis of the Structure of Middle-earth". Tolkien Studies. 2 (1). Project Muse: 197–216. doi:10.1353/tks.2005.0009. ISSN1547-3163. S2CID170238657.
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. S2CID140630128.
Brisbois, Michael J. (2005). "Tolkien's Imaginary Nature: An Analysis of the Structure of Middle-earth". Tolkien Studies. 2 (1). Project Muse: 197–216. doi:10.1353/tks.2005.0009. ISSN1547-3163. S2CID170238657.
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. S2CID140630128.
Brisbois, Michael J. (2005). "Tolkien's Imaginary Nature: An Analysis of the Structure of Middle-earth". Tolkien Studies. 2 (1). Project Muse: 197–216. doi:10.1353/tks.2005.0009. ISSN1547-3163. S2CID170238657.
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. S2CID140630128.