Gregoratti (2018), p. 1; Dąbrowa (2007), p. 125; Dąbrowa (2012), p. 175. (EN) Leonardo Gregoratti, Vologases I, in Roger Bagnall, The Encyclopedia of Ancient History, Leida, John Wiley & Sons, 2018. (EN) Edward Dąbrowa, The Parthian Kingship, in History of the Ancient Near East / Monographs, XI, S.A.R.G.O.N. Editrice e Libreria, 2007, pp. 123-134. (EN) Edward Dąbrowa, The Arsacid Empire, in Touraj Daryaee, The Oxford Handbook of Iranian History, Oxford University Press, 2012, ISBN978-0-19-987575-7.
Gregoratti (2017), p. 132. (EN) Leonardo Gregoratti, The Arsacid Empire, in Touraj Daryaee, King of the Seven Climes: A History of the Ancient Iranian World (3000 BCE - 651 CE), UCI Jordan Center for Persian Studies, 2017, ISBN978-06-92-86440-1.
Gregoratti (2017), p. 131. (EN) Leonardo Gregoratti, The Arsacid Empire, in Touraj Daryaee, King of the Seven Climes: A History of the Ancient Iranian World (3000 BCE - 651 CE), UCI Jordan Center for Persian Studies, 2017, ISBN978-06-92-86440-1.
Gregoratti (2017), pp. 131-132. (EN) Leonardo Gregoratti, The Arsacid Empire, in Touraj Daryaee, King of the Seven Climes: A History of the Ancient Iranian World (3000 BCE - 651 CE), UCI Jordan Center for Persian Studies, 2017, ISBN978-06-92-86440-1.
Gregoratti (2018), p. 1; Dąbrowa (2007), p. 125; Dąbrowa (2012), p. 175. (EN) Leonardo Gregoratti, Vologases I, in Roger Bagnall, The Encyclopedia of Ancient History, Leida, John Wiley & Sons, 2018. (EN) Edward Dąbrowa, The Parthian Kingship, in History of the Ancient Near East / Monographs, XI, S.A.R.G.O.N. Editrice e Libreria, 2007, pp. 123-134. (EN) Edward Dąbrowa, The Arsacid Empire, in Touraj Daryaee, The Oxford Handbook of Iranian History, Oxford University Press, 2012, ISBN978-0-19-987575-7.