Lochrie, K. (1999). Covert operations: The medieval uses of secrecy. University of Pennsylvania Press.
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Chicago-čujuhus (17. p.)
Lochrie, Karma. Covert Operations: The Medieval Uses of Secrecy. Philadelphia: University of Pennsylvania Press, 1999.
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MLA-čujuhus (9. p.)
Lochrie, Karma. Covert Operations: The Medieval Uses of Secrecy. University of Pennsylvania Press, 1999.
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