See The Works of George Santayana (15 vol., 1936–40) and The Philosophy of Santayana, ed. by I. Edman (rev. ed. 1953, repr. 1973); his letters (ed. by D. Cory, 1955; repr. 1973); his memoirs, Persons and Places (3 vol., 1944–53). See also B. J. Singer, The Rational Society (1970); T. N. Munson, The Essential Wisdom of George Santayana (1962, repr. 1983); W. E. Arnett, Santayana and the Sense of Beaury (1955, repr. 1984).