Wróbel, P. (1999) “George Castriota Scanderbeg and the first years of the Albanian state (1444-1448) in the light of the chronicle of Marino Barlezio - questions and doubts”, Balcanica Posnaniensia. Acta et studia, (9/10), pp. 117–132. doi: 10.14746/bp.1999.9-10.10.