Cassirer E (1944). "The Concept of Group and the Theory of Perception". Philosophy and Phenomenological Research. 5 (1): 1–35. doi:10.2307/2102891. JSTOR2102891.
Cassirer E (1944). "The Concept of Group and the Theory of Perception". Philosophy and Phenomenological Research. 5 (1): 1–35. doi:10.2307/2102891. JSTOR2102891.