Perry, J. A., & Perry, E. (1991). Contemporary society: An introduction to social science (6th ed.). Harper & Row.
Chicago-viite (17. p.)Perry, John A., ja Erna Perry. Contemporary Society: An Introduction to Social Science. 6th ed. New York: Harper & Row, 1991.
MLA-viite (8. p.)Perry, John A., ja Erna Perry. Contemporary Society: An Introduction to Social Science. 6th ed. Harper & Row, 1991.
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