https://parpatrimonioytecnologia.wordpress.com/2021/05/07/reconstruyendo-en-3d-el-castillo-de-gauzon-castrillon-asturias-la-fortaleza-en-la-que-se-forjo-la-cruz-de-la-victoria/

https://www.castillosnet.org/fortificacion.php?r=O-CAS-023