Gaya APA
Housley, N.
(1986).
The Avignon papacy and the crusades, 1305-1378.
.
Oxford:
Clarendon Press.
Gaya MLA
Housley, Norman.
"The Avignon papacy and the crusades, 1305-1378. ".
Oxford:
Clarendon Press,
1986.
Buku.