TIENKEN, C. H. Rankings of International Achievement Test Performance and Economic Strength: Correlation or Conjecture?. International Journal of Education Policy and Leadership, [S. l.], v. 3, n. 4, 2008. DOI: 10.22230/ijepl.2008v3n4a110. Disponível em: https://journals.sfu.ca/ijepl/index.php/ijepl/article/view/110. Acesso em: 25 oct. 2021.