BUTLER-ADAM, John. An investment in knowledge….producing new interest. South African Journal of Science, [S. l.], v. 111, n. 7/8, p. 2, 2015. DOI: 10.17159/sajs.2015/a0117. Disponível em: https://sajs.co.za/article/view/4164. Acesso em: 22 jul. 2024.