Conner, M. (1997–2013) Informal Learning [Online]. Available at http://marciaconner.com/ resources/ informal-learning/ [Tip: hold Ctrl and click a link to open it in a new tab. (Hide tip)] (Accessed 26 November 2015).
Hirschfeld, G., Krumeich, G. and Renz, I. (eds) (2012) Brill’s Encyclopedia of the First World War, vol. 2, Leiden, Brill.
Jeffs, T. and Smith, M.K. (1997–2012) ‘What is informal education’, The Encyclopaedia of Informal Education [Online]. Available at http://infed.org/ mobi/ what-is-informal-education/ (Accessed 26 November 2015).
Office for National Statistics (2015) Internet Users [Online]. Available at http://www.ons.gov.uk/ ons/ rel/ rdit2/ internet-users/ 2015/ index.html (Accessed 3 December 2015).
The Open University (2015) ‘What are you capable of?’, OpenLearn [Online]. Available at www.open.edu/openlearn/lifechanginglearning (Accessed 26 November 2015).
Wikipedia (2015) World War I casualties [Online] 4 December. Available at https://en.wikipedia.org/wiki/World_War_I_casualties (Accessed 4 December 2015).
Winter, J. (ed.) (2014) The Cambridge History of the First World War, vol. 3, Cambridge, Cambridge University Press.