https://portal.dnb.de/opac.htm?query=%22graf-martinez%22&method=simpleSearch&cqlMode=true

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Defensor Sporting Club

https://web.archive.org/web/20120217030117/http://www.defensorsporting.com.uy/defe.htm

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Defensor Sporting Club | Sitio oficial

https://archive.today/20120828235201/http://www.defensorsporting.com.uy/home/defe.php

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Historia | Defensor Sporting Club | Sitio oficial

https://web.archive.org/web/20121229150809/http://www.defensorsporting.com.uy/home/defe.php

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