Gaya APA
Al., P, H.
(2017).
Ajaran moral Paus Yohanes Paulus II.
.
Yogyakarta:
Yogyakarta Kanisius.
Gaya MLA
Al., Purwa, Hadiwardoyo,.
"Ajaran moral Paus Yohanes Paulus II. ".
Yogyakarta:
Yogyakarta Kanisius,
2017.
Buku.