Landsheere, Gilbert de, 1921-2001 Pre-school education in developing countries : an expert's overview; a resourcedocument / Gilbert de Landsheere - Paris : New York : Rome : UNESCO; UNICEF; EFP, 1979. - 4 p. - Notes, Comments...; 3. . No. de Clasificación Universal Decimal: 372.3 (-77) =20 LAN No.3