Bowler, John. Wildlife of Madeira and the Canary Islands. Princeton University Press, 5. o. (2018) „The Madeira archipielago belongs to Portugal and lies just under 400 km to the north of the Canary Island of Tenerife and 520 km west of Morocco.”
Beron, Petar. Zoogeography of Arachnida. Springer, 363. o. (2018) „Another archipielago, a Portgual territory, is Madeira, comprising the islands of Madeira, Porto Santo, Degeltas, and Selvagens, 520 km from the African coast.”
