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Pinto Basto, Guilherme (1997). "The Tragedy of Lisbon". British Historical Society of Portugal Annual Report (24). Archived from the original on 2 February 2021. Retrieved 25 January 2021.
cif.org.pt
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"CIF 2-0 Madrid". hemeroteca.mundodeportivo.com (in Spanish). Mundo Deportivo. 10 January 1907. Archived from the original on 14 October 2022. Retrieved 15 October 2022.
"História da Fundação dos FC Porto" [History of the Foundation of FC Porto]. aventar.eu (in Portuguese). 2 August 2022. Archived from the original on 17 October 2022. Retrieved 30 October 2022.
"CIF 2-0 Madrid". hemeroteca.mundodeportivo.com (in Spanish). Mundo Deportivo. 10 January 1907. Archived from the original on 14 October 2022. Retrieved 15 October 2022.
Pinto Basto, Guilherme (1997). "The Tragedy of Lisbon". British Historical Society of Portugal Annual Report (24). Archived from the original on 2 February 2021. Retrieved 25 January 2021.