1. Namibia 2011 Population and Housing Census Main Report. https://web.archive.org/web/20131002064316/ http://www.nsa.org.na/files/downloads/Namibia%202011%20Population%20and%20Housing%20Census%20Main%20Report.pdf.
2. Scottish Government Social Research 2010. Public attitudes towards the Scots language. Accessible at http://www.gov.scot/Resource/Doc/298037/0092859.pdf.