Unesco. (1949). A handbook for the improvement of textbooks and teaching materials as aids to international understanding. UNESCO.
芝加哥风格引文Unesco. A Handbook for the Improvement of Textbooks and Teaching Materials as Aids to International Understanding. Paris: UNESCO, 1949.
MLA引文Unesco. A Handbook for the Improvement of Textbooks and Teaching Materials as Aids to International Understanding. UNESCO, 1949.
警告：这些引文格式不一定是100％准确.