Columbia subject headings:
Monasterio de San Salvador de Oña--History--Sources.
Oña (Spain)--Church history--Sources.
Harvard subject headings:
Monasterio de San Salvador de Oña--History--Sources.
Oña (Spain)--Church history--Sources.
Princeton subject headings:
Monasterio de San Salvador de Oña--History--Sources.
Oña (Spain)--Church history--Sources.