■ Social Aspects of the Business Cycle, Londres, Routledge & Kegan Paul, 1925 ; avec THOMAS W. I., The Child in America : Behavior Problems and Programs, New York, A. A. Knopf, 1928 ; Social and Economic Aspects of Swedish Population Movements, 1750-1933, New York, MacMillan, 1941 ; avec KUZNETS S. et al. (dir.), Population Redistribution and Economic Growth, United States, 1870-1950, 2 vol., Philadelphie, American Philosophical Society, 1957-1960.
