United Nations Educational Scientific and Cultural Organization. (1973). The Present situation and trends of research in the field of special education, four studies: Sweden and other Scandinavian countries, Union of Soviet Socialist Republics, United States of America, Uruguay. Unesco.
Citazione stile Chigago Style (17a edizione)United Nations Educational Scientific and Cultural Organization. The Present Situation and Trends of Research in the Field of Special Education, Four Studies: Sweden and Other Scandinavian Countries, Union of Soviet Socialist Republics, United States of America, Uruguay. Paris: Unesco, 1973.
Citatione MLA (9a ed.)United Nations Educational Scientific and Cultural Organization. The Present Situation and Trends of Research in the Field of Special Education, Four Studies: Sweden and Other Scandinavian Countries, Union of Soviet Socialist Republics, United States of America, Uruguay. Unesco, 1973.