Kingsley 1990, pp. 245–265. Kingsley, Peter (1990), "The Greek Origin of the Sixth-Century Dating of Zoroaster", Bulletin of the School of Oriental and African Studies, 53 (2): 245–265, doi:10.1017/S0041977X00026069, S2CID162273109
Khlopin 1992, pp. 107–110. Khlopin, I.N. (1992), "Zoroastrianism – Location and Time of its Origin", Iranica Antiqua, 27: 96–116, doi:10.2143/IA.27.0.2002124
Nock 1929, p. 111. Nock, A. D. (1929), "(Book Review) Studien zum antiken Synkretismus aus Iran und Griechenland by R. Reitzenstein & H. H. Schaeder", The Journal of Hellenic Studies, 49 (1): 111–116, doi:10.2307/625011, JSTOR625011
Sieber 1973, p. 234. Sieber, John (July 1973), "An Introduction to the Tractate Zostrianos from Nag Hammadi", Novum Testamentum, 15 (3): 233–240, doi:10.1163/156853673X00079
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Malandra 2005, : "Controversy over Zaraθuštra's date has been an embarrassment of long standing to Zoroastrian studies. If anything approaching a consensus exists, it is that he lived ca. 1000 BCE give or take a century or so [...]". Malandra, William W. (2005), "Zoroastrianism: Historical Review", Encyclopaedia Iranica, New York: Encyclopædia Iranica online
Nock 1929, p. 111. Nock, A. D. (1929), "(Book Review) Studien zum antiken Synkretismus aus Iran und Griechenland by R. Reitzenstein & H. H. Schaeder", The Journal of Hellenic Studies, 49 (1): 111–116, doi:10.2307/625011, JSTOR625011
Kingsley 1990, pp. 245–265. Kingsley, Peter (1990), "The Greek Origin of the Sixth-Century Dating of Zoroaster", Bulletin of the School of Oriental and African Studies, 53 (2): 245–265, doi:10.1017/S0041977X00026069, S2CID162273109