Columbia subject headings:
Harvard subject headings:
Abbeys--Italy--Siena Region--History--Sources.
Monasticism and religious orders for women--Italy--Siena Region--History--Sources.
Montecelso (Abbey)--Archives.
Princeton subject headings:
Benedictine nuns--Italy--Siena--History--Sources.
Montecelso (Abbey)--History--Sources.
Siena (Italy)--Church history--Sources.
Siena (Italy)--History--Sources.