International yearbook of education, Vol. XXIII, 1961.
International yearbook of education, Vol. XXIII, 1961.
- Geneva : Paris : IBE, UNESCO, 1962.
- 500 p.
- IBE publication ; 236. .
OC 37 (100) =20 "1961" INN Vol. 23
OC 37 (100) =20 "1961" INN Vol. 23