Gaya APA
Derksen, J.
(1995).
Deus non vult. Opposition to the Crusades in Europe 1049 -1274.
.
:
.
Gaya MLA
Derksen, John.
"Deus non vult. Opposition to the Crusades in Europe 1049 -1274. ".
:
,
1995.
Majalah.