1. See Frank Napier, Noises Off: A Handbook of Sound Effects (London: Frederick Muller, 1936).
2. Ross Brown gives a very full and important account of sound scenography and its dramaturgy in Sound: A Reader in Theatre Practice (New York and Basingstoke: Palgrave Macmillan, 2010).
3. Erika Fischer-Lichte, The Show and the Gaze of Theatre: A European Perspective (Iowa City: University of Iowa Press, 1997), p. 115.
4. Hans-Thies Lehmann, Postdramatic Theatre, trans. by Karen Jürs-Munby (London and New York: Routledge, 2006), p. 17.
5. Michael Kirby, ‘The new theatre’, in Brooks McNamara and Jill Dolan (eds.), The Drama Review: Thirty Years of the Avant-Garde (Ann Arbor, MI: University of Michigan Research Press, 1986), pp. 63–4.