Westray (Polish Wikipedia)

An Audit Of Alien Species In Scotland. snh.org.uk. [zarchiwizowane z tego adresu (2016-03-03)]. (May 2004) (Microsoft Word). Edinburgh. Scottish Natural Heritage.

web.archive.org

Alan D Fleming: Scotland’s Census 2001 Statistics for Inhabited Islands. General Register Office for Scotland, 2003-11-28. [dostęp 2011-08-31]. (ang.).
NLB website. [dostęp 2009-03-25]. [zarchiwizowane z tego adresu (2015-06-07)].
An Audit Of Alien Species In Scotland. snh.org.uk. [zarchiwizowane z tego adresu (2016-03-03)]. (May 2004) (Microsoft Word). Edinburgh. Scottish Natural Heritage.