Miranda Prorsus by Pius XII
Full citation (italicize names of document and website):
Pius XII. Miranda Prorsus (Concerning the Cinema, Sound Broadcasting, and Television). 8 Sept. 1957. Vatican: The Holy See,
w2.vatican.va/content/pius-xii/en/encyclicals/documents/hf_p-xii_enc_08091957_miranda-prorsus.html.