Centro Vasco de Arquitectura
Euskal Herriko Arkitektura Ikerkundea
https://www.italianways.com/romes-basilica-of-saint-stephen-in-the-round-and-christmas-on-december-26th/
https://www.pinterest.es/pin/675047431622990527/
https://en.wikipedia.org/wiki/Santo_Stefano_al_Monte_Celio
https://es.wikipedia.org/wiki/Santo_Stefano_Rotondo
https://twitter.com/romamedieval/status/813341850132238336
https://www.tripadvisor.es/ShowUserReviews-g187791-d246179-r268226296-Santo_Stefano_Rotondo-Rome_Lazio.html
https://www.laguiaderoma.com/que-ver/iglesias/santo-stefano-in-rotondo/
http://lugaressacros.blogspot.com/2013/03/s-stefano-rotondo.html
https://seordelbiombo.blogspot.com/2018/10/santo-stefano-rotondo.html
https://descubriendonuevasciudades.blogspot.com/2014/05/las-iglesias-de-la-colina-de-celio-san.html