Spencer, 1855
Spencer, H., 1855, The Principles of Psychology, London: Longman, Brown, Green and Longmans; 2nd edn, 2 vols., 1870; 1872, London: Williams and Norgate
Spencer, H., 1855, The Principles of Psychology, London: Longman, Brown, Green and Longmans; 2nd edn, 2 vols., 1870; 1872, London: Williams and Norgate
