米国のReligion News Service (RNS)
The 11 sisters of Sierras are a rock band like ’nun’ other
2017/09/19
https://religionnews.com/2017/09/19/the-11-sisters-of-siervas-are-a-rock-band-like-nun-other/
BBC
Sister Monica and Sierras: The Peruvian nuns who rock
06 Feb 2017
https://www.bbc.com/news/av/world-latin-america-38859871/sister-monica-and-siervas-the-peruvian-nuns-who-rock
CatholcPhlly.com/ CNS (Catholic News Service)
For members of Sierras, ministry spans service, music for the soul
February 14, 2017
http://catholicphilly.com/2017/02/news/world-news/for-members-of-siervas-ministry-spans-service-music-for-the-soul/