Pereira, Hugo Silveira. β€œThe Ambaca Railway in Angola: History of a Failed Public-Private Partnership (1885-1914 and Briefly Onwards)”. Revista de Historia Industrial β€” Industrial History Review 28, no. 77 (November 20, 2019): 53–91. Accessed July 14, 2024. https://revistes.ub.edu/index.php/HistoriaIndustrial/article/view/28537.