Ep. 52 - Sources and Such
* Chronicler Nestor, Primary Chronicle (English translation)
* Paul Robert Magocsi, A History of Ukraine (1996)
* P. Karlin-Hayter, "When Military Affairs were in Leo's Hands: A Note on Byzantine Foreign Policy (886-912)" in Traditio (1967)
* R.J.H. Jenkins, "The Supposed Russian Attack on Constantinople in 907: Evidence of the Pseudo-Symeon" in Speculum (1949)
* Alex Roland, "Secrecy, Technology and War: Greek Fire and the Defense of Byznatium, 678-1204" in Technology and Culture (1992)
* A.A. Vasiliev, "The Second Russian Attack on Constantinople" in Dumbarton Oaks Papers (1951)
* Leontiy Vojtovych, Kniazivski Dynastii Shidnoii Evropy (2000)
* L. Voytovych, "Oleh Vischyj: Istoriohrafichni Lehendy ta Realii" in Naukovi Pratsi Kamianets-Podilskoho Nationalnoho Universytetu im. Ivana Ohienka