Perry, R. B. (1912). Present philosophical tendencies: A critical survey of naturalism, idealism, pragmatism and realism together with a synopsis of the philosophy of William James. Longmans, Green.
Citace podle Chicago (17th ed.)Perry, Ralph Barton. Present Philosophical Tendencies: A Critical Survey of Naturalism, Idealism, Pragmatism and Realism Together with a Synopsis of the Philosophy of William James. New York [u.a.]: Longmans, Green, 1912.
Citace podle MLA (9th ed.)Perry, Ralph Barton. Present Philosophical Tendencies: A Critical Survey of Naturalism, Idealism, Pragmatism and Realism Together with a Synopsis of the Philosophy of William James. Longmans, Green, 1912.
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