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.
Citação do estilo Chicago (17ª 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. Paris: Unesco, 1973.
Citação 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.