ZAMAN, T.; RAZA, A. Data, variables and measurement scales. Journal of Pakistan Association of Dermatologists, [S. l.], v. 15, n. 1, p. 60–65, 2016. DOI: 10.66344/jpad.15.1.2005.619. Disponível em: https://www.jpad.com.pk/index.php/jpad/article/view/619. Acesso em: 3 may. 2026.