Põlda, H., and K. Saatmann. “The Meaning of Adult Giftedness and Opportunities for Its Development in Non-Formal Education”. Eesti Haridusteaduste Ajakiri. Estonian Journal of Education, vol. 11, no. 2, Oct. 2023, pp. 223-49, doi:10.12697/eha.2023.11.2.09.