1. http://www.fficrpr.org/node/48
2. http://cianzadebovinos.blogspot.com/2009/04/historia-del-bovino.html
3. https://www.youtube.com/watch?v=rZqqqwsZ5EY
4. https://www.youtube.com/watch?v=qT1ufKE7uZI
5. https://www.youtube.com/watch?v=l_TXSIwL9u4
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