United Nations Educational Scientific and Cultural Organization. (2006). UNESCO open access resource directory. USA: United Nations Educational Scientific and Cultural Organization.
Trích dẫn kiểu ChicagoUnited Nations Educational Scientific and Cultural Organization. UNESCO Open Access Resource Directory. USA: United Nations Educational Scientific and Cultural Organization, 2006.
MLA引文United Nations Educational Scientific and Cultural Organization. UNESCO Open Access Resource Directory. USA: United Nations Educational Scientific and Cultural Organization, 2006.
警告:這些引文格式不一定是100%准確.