In collaboration with Josef Elfenbein and Prods O. Skjærvø. — Heidelberg: Winter, 1991. — Vol. 1: Introduction, Text and Translation. — (Indogermanische Bibliothek. Erste Reihe, Lehr- und Handbücher). — ISBN: 9783533044734. Zarathushtra was the founder and prophet of the pre-Islamic religion of Iran which covered not only present-day Iran and Afghanistan, but also large parts...
Wien : Verlag der Österreichischen Akademie der Wissenschaften, 2009. — ix, 255 p. — (Sitzungsberichte / Österreichische Akademie der Wissenschaften. Philosophisch-Historische Klasse, vol. 788). — ISBN: 9783700165644. Posthumously edited volume of Thordarson's work on an introduction to linguistic study of Ossetic (Introduction; Dialects; Language Contact; Noun Phrase; Pronouns).