Spiegel, Fr. Eranische Alterthumskunde (Leipzig, 1871-1878).

Harlez, C. de. Introduction to his French Translation of the Avesta (Paris, 1881).

Haug, M. Essays on the Parsis (3d ed., London, 1884).

Justi, F. Geschichte des alten Persiens, p. 67 ff. (Berlin, 1879).

Geiger, W. Civilization of the Eastern Iranians in Ancient Times (Eng. tr., London, 1885-1886).

Darmesteter, J. Le Zend-Avesta (Paris, 1892-1893).

Jackson, A. V. Williams, Die Iranische Religion (in Geiger and Kuhn's Grundriss der iranischen Philologie) (Strassburg, 1896-1904); Zoroaster (New York and London, 1899); Persia, Past and Present (New York, 1906); article "Avesta" (in Encyclopædia of Religion and Ethics); Religion of the Achæmenian Kings (according to the inscriptions), Journal of the American Oriental Society, xxi (New Haven, 1901).

Browne, E. G. Literary History of Persia, p. 95 ff. (London, 1902).

Geldner, K. F. Avestalitteratur, Grundriss der iranischen Philologie, ii; Eng. tr., in Studies in honor of Sanjana (Strassburg, 1904).

Sanjana. Zarathushtra and Zarathushtrianism in the Avesta (Leipzig, 1906).