GIBSON, A.; STEWART, J. Estimating learners’ vocabulary size under item response theory. Vocabulary Learning and Instruction, [S. l.], v. 3, n. 2, p. 78–84, 2014. DOI: 10.7820/vli.v03.2.gibson.stewart. Disponível em: https://www.castledown.com/journals/vli/article/view/vli.v03.2.gibson.stewart. Acesso em: 15 sep. 2026.