Gaya APA
O'Grady, J, F. (1997).
The Roman Catholic Church: Its origin and nature. .
New York/Mahwah:
New York/Mahwah Paulist Press.
Gaya MLA
O'Grady, John, F..
"The Roman Catholic Church: Its origin and nature. ".
New York/Mahwah:
New York/Mahwah Paulist Press,
1997.
Buku.