Towards a system of social and demographic statistics / Department of Economic and Social Affairs, Statistical Office. United Nations. Statistical Office. Demography Methodology. Social indicators. Time management surveys. JX1977 .A2 ST/ESA/STAT/ser.F/18 312 UNT "United Nations publication : Sales no. E.74.XVII.8." Bibliography: p. 181-187. New York : United Nations, 1975. 1975. 1975 Text xiv, 187 p. ; eng Studies in methods ; ser. F, no. 18 [Document] - United Nations ; ST/ESA/STAT/ser.F/18