Hawton, K. (2006). Richard ("Dick") John Ronald Ropner - Obituary.
Chicago-čujuhus (17. p.)Hawton, K. Richard ("Dick") John Ronald Ropner - Obituary. 2006.
MLA-čujuhus (9. p.)Hawton, K. Richard ("Dick") John Ronald Ropner - Obituary. 2006.
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