Dugdale, William, Sir. Monastery of St. Mary De Pree, De la Praye, De Prato, or De Pratis, near St. Albans, in Hertfordshire in Dugdale's Monasticon Volume 3 Vol. 3: 353-62

[Monastery of St. Mary De Pree, De la Praye, De Prato, or De Pratis, near St. Albans, in Hertfordshire]
With excerpts from primary sources in Latin.