Gaya APA
Hildebrand, D.
(-1972).
Ethics, (repr.). Cet.pertama 1953.
.
Chicago:
Franciscan Herald Press.
Gaya MLA
Hildebrand, D.von..
"Ethics, (repr.). Cet.pertama 1953. ".
Chicago:
Franciscan Herald Press,
-1972.
Buku.