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??? ???????? ???????? ( ??????????? : Unrestricted submarine warfare )? ?? ??? ?? ?????? ??????? ???? ????? ???? ???????? ????? ??? ??? ??????? ??????? ????? ???? ?? ????? ?? ?????. [1] [2] [3]

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  1. ^ Joel I., Holwitt (2005). Execute against Japan (???????????). Columbus: Ohio State University Press. 92
  2. ^ Joel I., Holwitt (2005). Execute against Japan (???????????). Columbus: Ohio State University Press. 93
  3. ^ "Lusitania divers warned of danger from war munitions in 1982, papers reveal" , The Guardian , 1 May 2014. ???? ?????? 2017-12-13 ?? Wayback Machine
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