Jenkins, Romilly James Heald (1967). De Administrando Imperio by Constantine VII Porphyrogenitus, New, revised, Corpus fontium historiae Byzantinae, Washington, D.C.: Dumbarton Oaks Center for Byzantine Studies, გვ. 65. ISBN0-88402-021-5. ციტირების თარიღი: 28 August 2013. According to Constantine Porphyrogenitus, writing in his De Administrando Imperio (ca. 950 AD) "Patzinakia, the Pecheneg realm, stretches west as far as the Siret River (or even the Eastern Carpathian Mountains), and is four days distant from Tourkia (i.e. Hungary)."