Perri, Giuseppe: The Peace on the Eastern Front and the Hetmanate of Skoropads'kyj (April-November 1918) in the Ukrainian Sources, in: Biagini, Antonello / Motta, Giovanna (eds.): First world war: analysis and interpretation, vol. 1, 2 vols., Newcastle upon Tyne 2015 Cambridge Scholars Press, pp. 297-306.