1. Boring EG (1942) Sensation and perception in the history of experimental psychology. New York: Appleton-Century-Crofts
2. Gruender H (1922) Psychology without a soul 3rd edn. St. Louis: Herder
3. McDougall W (1934) Religion and the sciences of life. Durham, NC: Duke University Press
4. Mercier D-J (1892,1923) Cours de philosophie, 11th edn (2 vols.) vol 2. Psychologie. Paris: Alcan
5. Mercier D-J (1918) Les origines de la psychologie contemporaine. There were three editions, 1897, 1908, and 1925. English translation by WH Mitchell: The origins of contemporary psychology, 2nd edn. New York: Kenedy and London: Washbourne