Unesco. (1949). A handbook for the improvement of textbooks and teaching materials as aids to international understanding. UNESCO.
Chicago-Zitierstil (17. Ausg.)Unesco. A Handbook for the Improvement of Textbooks and Teaching Materials as Aids to International Understanding. Paris: UNESCO, 1949.
MLA-Zitierstil (8. Ausg.)Unesco. A Handbook for the Improvement of Textbooks and Teaching Materials as Aids to International Understanding. UNESCO, 1949.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.