Kastriti, E., M. Kalogiannakis, S. Psycharis, and D. Vavougios. “The Teaching of Natural Sciences in Kindergarten Based on the Principles of STEM and STEAM Approach”. Advances in Mobile Learning Educational Research, Vol. 2, no. 1, Mar. 2022, pp. 268-77, doi:10.25082/AMLER.2022.01.011.