SMEREK, Lukáš et al. Comparison of the level of personnel work in the Czech Republic and Slovakia. In Sustainability. - Basel : Multidisciplinary Digital Publishing Institute, 2021. ISSN 2071-1050, 2021, vol. 13, no. 1, pp. [1-16]. Dostupné na: https://doi.org/10.3390/su13010287.