Schopenhauer, Arthur . On the Fourfold Root of the Principle of Sufficient Reason and The Will in Nature / Textual Documents Arthur Schopenhauer. - 1st ed. / - London : G Bell & Sons , 1915. - 379p. : ill ; 18cm . Subjects--Index Terms: Philosophical essays G-Philosophy Dewey Class. No.: 111.821 / Sc 65 F