@book{1821,
	author = {Sherif, Muzafer, and Cantril, Hadley,},
	title = {The psychology of ego-involvements, social attitudes & identifications /},
	publisher = {J. Wiley & Sons, Inc.;},
	year = {1966.},
	address = {New York,},
	edition = {1st. science ed.}
}