Shippey, Prof. Tom (2005). The Road to Middle Earth. HarperCollins. str.139–140. ISBN0-261-10275-3. Shippey notes that Tolkien uses 'Mercian' forms of Anglo-Saxon, e.g., "Saruman, Hasufel, Herugrim for 'standard' [Anglo-Saxon] Searuman, Heasufel and Heorugrim" Footnote page 140