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2. Central Statistical Office: 1965, A nap 24 �r�ja (The 24 Hours of the Day) (Budapest).
3. Central Statistical Office: 1980, Id�m�rleg (Time-Budget).
4. Zapf, W.: 1981, ?Welfare production: public versus private?, paper prepared for the Committee on Political Sociology.
5. Zapf, W.: no date, ?The welfare state and welfare production?, Arbeitspapier No. 25, Sonderforschungsbereich 3 (Mikro-analytische Grundlagen der Gesellschaftspolitik).