Não informado. (2021). The Unesco Courier. United Nations Educational, Scientific and Cultural Organization (Unesco).
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. The Unesco Courier. Paris: United Nations Educational, Scientific and Cultural Organization (Unesco), 2021.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. The Unesco Courier. United Nations Educational, Scientific and Cultural Organization (Unesco), 2021.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.