Social philosophies of an age of crisis / Pitirim A. Sorokin. Sorokin, Pitirim A. (Pitirim Aleksandrovich), 1889-1968. Sociology History. 301.15 19 SOS First pub. U.S.A. 1950. Includes bibliographical references and index. London : Black, 1952. 1952. 1952 Text xi, 345 p. ; eng