Pryčyny upadku ukraïns'koï deržavy v knjaži i kozacki časy (Vyklady na U.K.U.) = The causes of the fall of the Ukrainian state in princely and cossack times - Isaïv, Petro M. 1905-1973 (1975)
In kyrill. Schr., ukrain. - Zsfassung in engl. Sprache