Dudley, Sheldon F. . The Four Pillars of Wisdom: A Rational Approach to a Healthy Education / Textual Documents Sheldon F.Dudley. - 1st ed. / - London : Johnson`s Court , 1950. - 245p. : ill ; 20cm . Ref. ISBN: PB Subjects--Index Terms: Education G-Education Dewey Class. No.: 370.1 / D 865 F