Barroca, M. J. “A Matriz Sigilar Medieval De Martim Abarca (Tavira)”. Portugalia : Journal Fo Archaeology of the Deparment of Heritage Studies of the Faculty of Arts and Humanities of the Universitu of Porto, vol. 37, Sept. 2017, pp. 55-67, https://ojstest.xyz/ojsletras/index.php/Port/article/view/2901.