Citation Simpson I, Dockrill SJ, Guttmann EB, Bull ID & Evershed RP (2007) Soils and the early cultural landscape. In: Dockrill S (ed.) Investigations in Sanday, Orkney Volume 2: Tofts Ness, Sanday - An island landscape through 3,000 years of prehistory. Edinburgh: The Orcadian Ltd and Historic Scotland, pp. 239-252.
Simpson, Ian; Dockrill, Stephen J; Guttmann, Erika B; Bull, Ian D; Evershed, Richard P