La Nomenclature Sociale (Extrait de La Revue, "La Science Sociale," Dec. 1886) Paris, Firmin-Diact, 1887.
Demoulins, La Science Sociale d'apres F. Le Play 1882-1905; Classification Sociale, "La Science Sociale," Jan. 1905.
Tarde, "L'imitation Sociale," and other works.