Gaya APA
XI, P. (1954).
Divini illius magistri, The christian education of youth. Encyclical letter 1929. .
London:
CTS.
Gaya MLA
XI, Pius.
"Divini illius magistri, The christian education of youth. Encyclical letter 1929. ".
London:
CTS,
1954.
Buku.