Cardoso, João Luís. “Correspondence Sent by Eminent Spanish Pre-Historians or Who Worked Mainly in Spain to José Leite De Vasconcelos (1853-1941)”. Estudos Arqueológicos De Oeiras, vol. 23, May 2017, pp. 393-58, https://eao.oeiras.pt/index.php/DOC/article/view/301.