Stojanović, Biljana J., et al. “Project-Based Learning in Early Childhood Education in Serbia: First Experiences of Preschool Teachers”. International Journal of Cognitive Research in Science, Engineering and Education (IJCRSEE), vol. 11, no. 2, Aug. 2023, pp. 213-20, doi:10.23947/2334-8496-2023-11-2-213-220.