1. Archival card index. Facebook. https://www.facebook.com/Архівна-картотека-232839000924633
2. Arkhivna kartoteka [Archival Card Index] (2018–2021). https://ak.iul-nasu.org.ua
3. Karpilovska, Ye. (2022). Povernena leksyka yak resurs dlia zaminy vkraplen i kalok [Vocabulary returned as a resource to replace blots and tracings]. Leksykohrafichnyi biuleten, 31, 24–34.
4. Krymskyi, A. (1907). Ukrainskaya grammatika dlya uchenikov vysshykh klassov gimnazіy i seminarіy Pridneprovya [Ukrainian grammar for students of higher classes of gymnasiums and seminaries of the Dnieper region] (Vol. 1. Issue 1).
5. Melnychuk, O., Kolomiets, V., Lukinova, T., Pivtorak, H., Sklyarenko, V., Tkachenko, O. (Eds.). (2012). Etymolohichnyi slovnyk ukrainskoi movy [Etymological dictionary of the Ukrainian language] (Vol. 6). Naukova dumka.