The other three are Christian Bartholomae's "Die Gathas des Awesta" (1905, Strassburg: Trübner), Helmut Humbach's "The Gathas of Zarathushtra" (1959, Heidelberg: Winter), and Stanley Isler's "The Gathas of Zarathustra" (1975, Acta Iranica IV, Leiden: Brill).