Ryan 2013, hlm. 301. Ryan, Martin J. (2013). "Conquest, Reform and the Making of England". Dalam Higham, Nicholas J.; Ryan, Martin J. The Anglo-Saxon World. New Haven, Connecticut: Yale University Press. hlm. 284–322. ISBN978-0-300-12534-4.
Ryan 2013, hlm. 298. Ryan, Martin J. (2013). "Conquest, Reform and the Making of England". Dalam Higham, Nicholas J.; Ryan, Martin J. The Anglo-Saxon World. New Haven, Connecticut: Yale University Press. hlm. 284–322. ISBN978-0-300-12534-4.
Thacker 1985, hlm. 5; Charter S 221. Thacker, Alan (1985). "Kings, Saints and Monasteries in Pre-Viking Mercia". Midland History. X: 1–25. doi:10.1179/mdh.1985.10.1.1. ISSN1756-381X."Charter S 221". The Electronic Sawyer: Online Catalogue of Anglo-Saxon Charters. London, UK: King's College London. Diakses tanggal 15 September 2016.
Thacker 1985, hlm. 5; Charter S 221. Thacker, Alan (1985). "Kings, Saints and Monasteries in Pre-Viking Mercia". Midland History. X: 1–25. doi:10.1179/mdh.1985.10.1.1. ISSN1756-381X."Charter S 221". The Electronic Sawyer: Online Catalogue of Anglo-Saxon Charters. London, UK: King's College London. Diakses tanggal 15 September 2016.
Thacker 1985, hlm. 5; Charter S 221. Thacker, Alan (1985). "Kings, Saints and Monasteries in Pre-Viking Mercia". Midland History. X: 1–25. doi:10.1179/mdh.1985.10.1.1. ISSN1756-381X."Charter S 221". The Electronic Sawyer: Online Catalogue of Anglo-Saxon Charters. London, UK: King's College London. Diakses tanggal 15 September 2016.