Roots and Branches: Selected Papers on Tolkien (Zurich and Berne: Walking Tree Publishers, Cormarë Series 11, 2007, ISBN 978-3-905703-05-4)
Martin Simonson, The Lord of the Rings and the Western Narrative Tradition (2009), ISBN 978-3-905703-09-2
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Beowulf and the Dragon, Walking Tree Publishers (2009), ISBN 978-3-905703-17-7 (the dragon episode of Beowulf, Old English text with the translation by John Porter, foreword by Tom Shippey)