Não informado. World cartography. United Nations, Department of Social Affairs.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. World Cartography. New York: United Nations, Department of Social Affairs.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. World Cartography. United Nations, Department of Social Affairs.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.