Não informado. (1948). International Yearbook of Education. Unesco.
Style de citation Chicago (17e éd.)Não informado. International Yearbook of Education. Geneva, Suíça: Unesco, 1948.
Style de citation MLA (8e éd.)Não informado. International Yearbook of Education. Unesco, 1948.
Attention : ces citations peuvent ne pas être correctes à 100%.