na INLIS000000000010510 Ind 0010-1118010510 On the theory of social change HAGEN, Everett E. Everett E. Hagen Jllinois Dorsy Press 1963 xv, 557 p.; 26 cm. xv, 557 p.; 26 cm. 301.15HAGo Part I. The Nature of the problem Bibl. p. 525-557 301.15 SOCIAL CHANGE 534/65