APA

World Health Organization, Regional Office for Europe, . (1977). Problems of children of school age (10-13 years). Report on a Working Group, Moscow, 30 November - 3 December 1976. Köpenhamn: World Health Organization.

Chicago

World Health Organization, Regional Office for Europe, . 1977. Problems of children of school age (10-13 years). Report on a Working Group, Moscow, 30 November - 3 December 1976. Köpenhamn: World Health Organization.

Harvard

World Health Organization, Regional Office for Europe, . (1977). Problems of children of school age (10-13 years). Report on a Working Group, Moscow, 30 November - 3 December 1976. Köpenhamn: World Health Organization.

MLA

World Health Organization, Regional Office for Europe, . Problems of children of school age (10-13 years). Report on a Working Group, Moscow, 30 November - 3 December 1976. Köpenhamn: World Health Organization. 1977.