Huttmanová, Emília, Tomáš Valentiny, i Roman Novotný. 2018. „Assessment of the Similarity of the Eu Countries in the Process of Sustainable Development in the Context of Agenda 2030 Goals”. Współczesne Problemy Zarządzania 6 (2(13). Jarosław:123-33. https://doi.org/10.52934/wpz.97.