International yearbook of education, Vol. XXIX, 1967.
International yearbook of education, Vol. XXIX, 1967.
- Geneva : Paris : IBE, UNESCO, 1968.
- 537 p.
- IBE publication ; 310. .
OC 37 (100) =20 "1967" INN Vol. 29
OC 37 (100) =20 "1967" INN Vol. 29