(en) James I. McNelis III, «xa0The tree took me up from ground and carried me offxa0: A Source for Tolkien’s Ents in Ludvig Holbergs Journey of Niels Klim to the World Undergroundxa0», Tolkien Studiesxa0: An Annual Scholarly Review, West Virginia University Press, vol.xa03,u200e 2006, p.xa0153-156 (DOIxa010.1353/tks.2006.0022).