International yearbook of education, Vol. XIX, 1957.
International yearbook of education, Vol. XIX, 1957.
- Geneva : Paris : IBE, UNESCO, 1957.
- 497 p.
- IBE publication ; 190. .
OC 37 (100) =20 "1957" INN Vol.19.
OC 37 (100) =20 "1957" INN Vol.19.