Potapenko, S. (2021). Was Hryhorii Hrabianka Ivanovychem? Oath of the Hadiach Regiment of 1718 / Arrangement, preface and comments by Ivan Sinyak. Kyiv, 2021. 568 p. Kyiv Historical Studies, (2 (13), 143–145. https://doi.org/10.28925/2524-0757.2021.219