Causes and Consequences of Mortality Declines in Less Developed Countries during the Twentieth Century

Samuel H. Preston, Population and Economic Change in Developing Countries (University of Chicago Press, 1980), chap. 5, https://www.nber.org/books-and-chapters/population-and-economic-change-developing-countries/causes-and-consequences-mortality-declines-less-developed-countries-during-twentieth-century.