* {{citeCita encyclopediaenciclopedia|title=Trebbia|encyclopedia=The American Heritage Dictionary of the English Language|edition=cuarta|year=2000|url=http://www.bartleby.com/61/46/T0334600.html}}
* {{citeCita encyclopediaenciclopedia|title=Trĕbĭa|encyclopedia=A Latin Dictionary|author=Charlton T. Lewis|coauthors=Charles Short|location=Oxford|publisher=Clarendon Press|year=1879|url=http://www.perseus.tufts.edu/hopper/text.jsp?doc=Perseus:text:1999.04.0059:entry=Tre^bi^a1&highlight=trebbia}}