@book{33698,
	author = {Hagen, Everett Einar, and Massachusetts Institute of Technology.},
	title = {On the theory of social change :},
	publisher = {Dorsey Press,},
	year = {1962 [printing 1967]},
	series = {The Dorsey series in anthropology and sociology},
	address = {Homewood, Ill. :}
}