The principles of state interference: four essays on the politica l philosophy of Mr. Herbert Spencer, J. S Mill and T. H. Green/ y Da vid G. Ritchie - Ritchie, David George, 1853-1903. (London : S. Sonnenschein & co., 1891)
Keywords: Spencer, Herbert, -- 1820-1903; Mill, John Stuart, -- 1806-1873.; Green, Thomas Hill, -- 1836-1882.; Political science