Malkova, Z. A. International yearbook of education. volume XXXIX 1987 : secondary education in the world today / by Z. A. Malkova; B. L. Vulfsonn. - París : Geneva : UNESCO ; IBE, 1988. - 209 p. ; il. ISBN: 9231025201 No. de Clasificación Universal Decimal: OC 37 (100) =20 "1987" INN.