The opinions of pre-primary education teachers on the advantages and disadvantages of heterogeneous age groups

ROCHOVSKÁ, Ivana et al. The opinions of pre-primary education teachers on the advantages and disadvantages of heterogeneous age groups. In Problems of education in the 21st century. - Šiauliai : Scientia Socialis, 2019. ISSN 1822-7864, 2019, vol. 77, no. 3, pp. 424-436. Dostupné na: https://doi.org/10.33225/pec.