APA
International encyclopedia of social sciences. New York:The Macmillan Co. and The Free Press, Collier-Macmillan Publishers,London,1968: .
Chicago
International encyclopedia of social sciences. New York:The Macmillan Co. and The Free Press, Collier-Macmillan Publishers,London,1968: .
Harvard
International encyclopedia of social sciences. New York:The Macmillan Co. and The Free Press, Collier-Macmillan Publishers,London,1968: .
MLA
New York:The Macmillan Co. and The Free Press, Collier-Macmillan Publishers,London,1968: . .
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