The Irish Canons: Collection of the Tithe
- From the Medieval Sourcebook.
- http://www.fordham.edu/halsall/source/750Eiretith.html

Division of the Tithe in Spain
- Regulation by the Fourth Council of Toledo in 633 taking power from the lower clergy to the bishops. From the Medieval Sourcebook.
- http://www.fordham.edu/halsall/source/633Spantith.html

Lay Tithes
- Article in the Catholic Encyclopedia on the alienation of tithes from the church.
- http://www.newadvent.org/cathen/09095b.htm

On Tithes
- Proclomation from the Holy Roman Emperor Louis the Piousin 817. From the. Medieval Sourcebook
- http://www.fordham.edu/halsall/source/817Lou2tith.html