Não informado. (2021). The Unesco Courier. United Nations Educational, Scientific and Cultural Organization (Unesco).
Chicago-referens (17:e uppl.)Não informado. The Unesco Courier. Paris: United Nations Educational, Scientific and Cultural Organization (Unesco), 2021.
MLA-referens (8:e uppl.)Não informado. The Unesco Courier. United Nations Educational, Scientific and Cultural Organization (Unesco), 2021.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.