Knight 2009, p. 12; Taylor 1961, p. 174 Knight, Jeremy K. (2009) [1991]. The Three Castles: Grosmont Castle, Skenfrith Castle, White Castle (revised ed.). Cardiff, UK: Cadw. ISBN978-1-85760-266-1. Taylor, A. J. (1961). "White Castle in the Thirteenth Century: A Re-Consideration". Medieval Archaeology. 5: 169–175. doi:10.1080/00766097.1961.11735651.
Radford 1962, p. 4; Knight 2009, p. 7 Radford, C. A. Ralegh (1962). White Castle, Monmouthshire. London, UK: Her Majesty's Stationery Office. OCLC30258313. Knight, Jeremy K. (2009) [1991]. The Three Castles: Grosmont Castle, Skenfrith Castle, White Castle (revised ed.). Cardiff, UK: Cadw. ISBN978-1-85760-266-1.
Knight 2009, p. 15; Radford 1959, p. 3; Royal Commission on Ancient Monuments in Wales and Monmouthshire 1912, pp. 60–61 Knight, Jeremy K. (2009) [1991]. The Three Castles: Grosmont Castle, Skenfrith Castle, White Castle (revised ed.). Cardiff, UK: Cadw. ISBN978-1-85760-266-1. Radford, C. A. Ralegh (1959) [1949]. Skenfrith Castle, Monmouthshire. London, UK: Her Majesty's Stationery Office. OCLC27818100. Royal Commission on Ancient Monuments in Wales and Monmouthshire (1912). Minutes of Evidence Given Before the Royal Commission on Ancient Monuments in Wales and Monmouthshire. London, UK: His Majesty's Stationery Office. OCLC757802640.
Radford 1959, p. 3 Radford, C. A. Ralegh (1959) [1949]. Skenfrith Castle, Monmouthshire. London, UK: Her Majesty's Stationery Office. OCLC27818100.