International yearbook of education, Vol. XVIII, 1956.
International yearbook of education, Vol. XVIII, 1956.
- Geneva : Paris : IBE, UNESCO, 1956.
- 466 p.
- IBE publication ; 180. .
OC 37 (100) =20 "1956" INN Vol.18.
OC 37 (100) =20 "1956" INN Vol.18.