A statistical study of wastage at school. (1972). UNITED Nations Educational Scientific and Cultural Organization, Office of Statistics. A statistical study of wastage at school: A study prepared for the International Buronu of Education. UNESCO.
Lua i Stíl Chicago (17ú heag.)A statistical study of wastage at school. UNITED Nations Educational Scientific and Cultural Organization, Office of Statistics. A Statistical Study of wastage at School: A Study Prepared for the International Buronu of Education. UNESCO, 1972.
Lua MLA (9ú heag.)A statistical study of wastage at school. UNITED Nations Educational Scientific and Cultural Organization, Office of Statistics. A Statistical Study of wastage at School: A Study Prepared for the International Buronu of Education. UNESCO, 1972.