1. 1. Alekseyev L. V. (1966), Polotskaya zemlya. (Ocherki istorii Severnoy Belorussii): v IX-XIII vv., Nauka, Moskva. (In Russian).
2. 2. Davnya istoriya Ukrayiny (2000), Tolochko P. P. (ed.), Vol. 3, Kyyiv. (In Ukrainian).
3. 3. Diadechko O. (2017), "Znakhidka varhanu zi starodavn'oho Lyubecha", Seredn'ovichni ta rann'omoderni starozhytnosti Tsentral'no-Skhidnoyi Yevropy: Materialy XVI Mizhnarodnoyi student•s'koyi naukovoyi arkheolohichnoyi konferentsiyi, kviten' 7-9, 2017, Chernihiv, pp. 40-1. (In Ukrainian).
4. 4. Kazakov E. P. (1977), "Drevniye yazychkovyye instrumenty Pri-kam'ya i Priural'ya", Sovetskaya etnografiya, No. 1, pp. 107-9. (In Russian).
5. 5. Kolchin B. A. (1979), "Kollektsiya muzykal'nykh instrumentov drevnego Novgoroda", Pamyatniki kul'tury: Novyye otkrytiya. 1978 g., Leningrad, pp. 174-87. (In Russian).