Perrin, R. (2005). Handbook for college research (3rd ed.). Houghton Mifflin Company.
Chicago-viite (17. p.)Perrin, Robert. Handbook for College Research. 3rd ed. Boston, New York: Houghton Mifflin Company, 2005.
MLA-viite (9. p.)Perrin, Robert. Handbook for College Research. 3rd ed. Houghton Mifflin Company, 2005.
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