http://www.bbc.co.uk/insideout/southwest/series3/secondworldwar_pillboxes_defence.shtml
http://www.staffshomeguard.co.uk/DotherReminiscences91Devon.htm
http://www.bbc.co.uk/programmes/p00p79h2
http://www.pastscape.org.uk/hob.aspx?hob_id=1320523&sort=4&search=all&criteria=light%20anti%20aircraft&rational=q&recordsperpage=60&p=23&move=n&nor=1576&recfc=1000