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Structural references (also known as Arda structural references) is a term coined by Beregond, Anders Stenström in 1998, aimed at simplifying the usage of giving references to the works of J.R.R. Tolkien by employing abbreviations and some conventions developed in Arda.
- "A structural reference identifies an element of the text by help of its place in the text's structure (rather than by its place in the layout of the book, which does not work when editions differ in layout)."
- ― Beregond, Anders Stenström
A Spanish version of the Arda structural references, called the Ardarathorn Project, was presented by the Spanish Tolkien Society in 2004.
- The Arda format for structural references to the works of J.R.R. Tolkien
- Ardarathorn Project (download zip-file, content in Spanish and English)