BÉRTOLI, Patricia P.; SHEPHERD, Tania M. G. Academic Writing: An Exploratory Study of Quadrigrams. The ESPecialist, [S. l.], v. 36, n. 2, 2015. Disponível em: https://revistas.pucsp.br/index.php/esp/article/view/23980. Acesso em: 5 dec. 2025.