User:C.recalde/sandbox8

Dear Anthony Appleyard,  thanks for your comment. The text of this article comes from https://unesdoc.unesco.org/ark:/48223/pf0000261445?posInSet=4&queryId=27597665-097f-4d43-846e-fbbd20e46480 which is a publication published under the license CC BY SA, which allows content to be copied/pasted and turned into Wikipedia articles. The following template is to be added to such articles:

I was going to add the template to this article, but I didn't have the opportunity to do so, as it was deleted too fast. Would it be possible to revert this? Thanks.