Coba jelasin Sumber dari Pertempuran Pliska dong

Theophanes the Confessor, Chronographia, Ed. Carl de Boor, vol. I, 1883, vol. II, 1885, Leipzig.

Scriptor Incertus. Anonymous Vatican Narration (Narratio anonyma e codice Vaticano), In: Codice Vaticano graeca 2014 (XII s.) ff. 119–22; Ivan Duychev (1936) New Biographic Data on the Bulgarian Expedition of Nicephorus I in 811, Proc. Bulg. Acad. Sci. 54:147–88 (in Bulgarian); H. Grégoire (1936) Un nouveau fragment du "Scriptor incertus de Leone Armenio", Byzantion, 11:417–27; Beshevliev, V (1936) The New Source About the Defeat of Nicephorus I in Bulgaria in 811, Sofia University Annual Reviews, 33:2 (In Bulgarian).

Mannases Chronicle, 1335–1340. Apostolic Library. The Vatican.

Michael the Syrian, Chronique de Michel le Syrien, Patriarche Jacobite d'Antioche (1166–1199), published by Jean Baptiste Chabot (in French). 1st Ed. Paris: Ernest Leroux, 1899–1910, ; 2nd Ed. Bruxelles: Culture et Civilisation, 1963,

B. Flusin (trans.), J.-C. Cheynet (ed.), Jean Skylitzès: Empereurs de Constantinople, Ed. Lethielleux, 2004, .

Joannes Zonaras. Epitome historiarum, ed. L. Dindorfii, 6 vol., Lipsiae (BT), 1858–75.