The Encyclopedia Herald of Ukraine
Stanislav Kulchytskyi. (2009). "History of Ukraine in encyclopedic format". The Encyclopedia Herald of Ukraine. Retrieved 2020-04-09 from http://evu.encyclopedia.kiev.ua/en/vol-1/history-of-ukraine-in-encyclopedic-format/.
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.