Hawkins, K. O. (1971). Parole selection: The American experience. University of Cambridge.
Čikaški stil citiranja (17. izdanje)Hawkins, Keith Owen. Parole Selection: The American Experience. University of Cambridge, 1971.
MLA način citiranja (8. izdanje)Hawkins, Keith Owen. Parole Selection: The American Experience. University of Cambridge, 1971.
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