International yearbbok of education, Vol. XX, 1958.
International yearbbok of education, Vol. XX, 1958.
- Geneva: IBE; Paris: UNESCO, 1958.
- 432 p.
- IBE publication; 202 .
OC 37 (100) =20 "1958" INN Vol.20.
OC 37 (100) =20 "1958" INN Vol.20.