Martín, Germán Rodríguez, João Luís Cardoso, and Guilherme Cardoso. “Ivory Roman Umbrella Handle Found in Oeiras (Portugal)”. Estudos Arqueológicos de Oeiras 27 (July 29, 2020): 377–386. Accessed November 13, 2026. https://eao.oeiras.pt/index.php/DOC/article/view/360.