Aladzhov, Andrey, Yanko Dimitrov, Stanislav Ivanov, Stanimir Stoichev, Hristina Stoyanova, and Vladimir Valchev. “Археологическа карта на Плиска. Теренни издирвания на територията на Плиска през 2017 г.: Archaeological Map of Pliska. Field Survey of the Territory of Pliska in 2017”. Bulgarian e-Journal of Archaeology | Българско е-Списание за Археология 8, no. 2 (December 20, 2018): 213–232. Accessed May 20, 2022. https://be-ja.org/index.php/journal/article/view/be-ja-8-2-2018-213-232.