HAGAN, F. E. (1997). Research methods in criminal justice and criminology. Allyn and Bacon.
Chicago-referens (17:e uppl.)HAGAN, Frank E. Research Methods in Criminal Justice and Criminology. Boston: Allyn and Bacon, 1997.
MLA-referens (9:e uppl.)HAGAN, Frank E. Research Methods in Criminal Justice and Criminology. Allyn and Bacon, 1997.
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