Aurora Environmental Ltd. 2003. Update of the environmental assessment for sand ex-traction and management scheme at the fourth Churchill Barrier.
Cormack, A. and Cormack, A. 1992 Bolsters, Blocks, Barriers: The Story of the Building of the Churchill Barriers. The Orkney View, Kirkwall, Orkney. pp.84.
Glennie, J. 1990. Potential for the Churchill Barriers, Orkney, for hydro-electric development. M.Sc MRDP dissertation (unpublished), Heriot-Watt University.
Gutiérrez-Elorza, M., Desir, G., Gutiérrez-Santolalla, F. and Marín, C. 2005. Origin and evolution of pla-yas and blowouts in the semiarid zone of Tierra de Pinares (Duero Basin, Spain). Geomorphology, 72, 177-192.
Hesp, P. 2002. Foredunes and blowouts: initiation, geomorphology and dynamics. Geomorphology, 48 (1-3), 245-268.
Murray, E., Dalkin, M.J., Fortune, F. and Begg, K. 1999 Marine Nature Conservation Review Sector 2. Orkney: area summaries. Peterborough Joint Nature Conservation Committee (Coasts and Seas of the United Kingdom. MNCR Series). In Ove Arup & Partners Scotland. 2000 Causeway Re-view, Environmental Review of Causeways. Scottish Natural Heritage Commissioned report F99AA403.
Robinson, M. 2008. The Churchill Barriers, of Orkney: a large-scale, open-air marine laboratory. Quaternary Newsletter No.116. pp61-68