Cravinho, G., and J. J. R. de Sousa. “Um Anel Romano De Stª Cristina Dos Longos”. Portugalia : Journal Fo Archaeology of the Deparment of Heritage Studies of the Faculty of Arts and Humanities of the Universitu of Porto, vol. 26, Apr. 2018, pp. 113-8, https://ojstest.xyz/ojsletras/index.php/Port/article/view/3815.