Szreter, Simon (1988). "The importance of social intervention in Britain's mortality decline c.1850–1914: A re-interpretation of the role of public health". Social History of Medicine. 1: 1–37. doi:10.1093/shm/1.1.1. (langganan diperlukan)
econlib.org
"Malthus, An Essay on the Principle of Population: Library of Economics" (description), Liberty Fund, Inc., 2000, EconLib.org webpage: EconLib-MalPop.