Epstein, Urban Communities in Africa – Closed Systems and Open Minds, 1964. C.R. Boxer, (1977). The Portuguese seaborne empire, 1415–1825, pp. 26–7, 30 London
[2023-04-23], (原始内容存档于2024-03-07) (Translation of da Cruz's 1569 book, with C.R. Boxer's comments) Seargent, David A. The Greatest Comets in History: Broom Stars