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2. * Malthus, T.R. (1803). An Essay on the Principle of Population. Second edition. London: J. Johnson.
3. * Malthus, T.R. (1815a). An Inquiry into the Nature and Progress of Rent. London: John Murray.
4. * Malthus, T.R. (1815b). The Grounds of an Opinion on the Policy of Restricting the Importation of Foreign Corn. London: John Murray.
5. * Malthus, T.R. (1817). An Essay on the Principle of Population. Fifth edition. London: John Murray.