Não informado. (2001). Scientific investigations. Scottish Home Department, Department of Agriculture and Fisheries.
Chicago-referens (17:e uppl.)Não informado. Scientific Investigations. Edinburgh, Inglaterra: Scottish Home Department, Department of Agriculture and Fisheries, 2001.
MLA-referens (8:e uppl.)Não informado. Scientific Investigations. Scottish Home Department, Department of Agriculture and Fisheries, 2001.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.