Malthus et les économistes, ou, Y aura-t-il toujours des pauvres? - Leroux, Pierre (P. Leroux, 1849)
Goldsmiths'-Kress no. 36675. - OCLC, 20189951. - Originally published in the Revue sociale, January-April, 1846, under title: De la recherche des biens matériels.–Pref. - Reproduction of original from Kress Library of Business and Economics, Harvard University