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2. Oxford Paperbacks Oxford World's Classics: Oxford, UK, 2008, 208 pages.
3. Mayhew R.J.: Malthus: The Life and Legacies of an Untimely Prophet (Harvard University Press, Cambridge, UK, 2014).
4. Selections from the Edinburgh Review Comprising the Best Articles Form that Journal, from its Commencement to the Present Time with a Preliminary Dissertation and Explanatory Notes, Cross M. ed., Vol. III (of VI); Baudry’s European Library: Paris (1835); p. 133.
5. Stanley Jevons W., The Coal Question, 2nd ed. (Macmillan and Co., London, UK, 1866).