CHAIKLIN, Seth. Age as a historical materialist concept in cultural-historical theory of human development. Obutchénie. Revista de Didática e Psicologia Pedagógica, [S. l.], v. 3, n. 3, p. 1–27, 2019. DOI: 10.14393/OBv3n3.a2019-51707. Disponível em: https://seer.ufu.br/index.php/Obutchenie/article/view/51707. Acesso em: 12 dez. 2025.