D. Hajdú, “The impact of population processes on adult training in Borsod-Abaúj-Zemplén County between 2010 and 2019”, Studia Mundi – Economica, vol. 8, no. 3, pp. 131–142, Sep. 2021, doi: 10.18531/Studia.Mundi.2021.08.03.131-142.