Samuel Beckett's Dramatic Strategy. Audience Laughter and the Postmodernist Debate
M. Tönnies, Samuel Beckett’s Dramatic Strategy. Audience Laughter and the Postmodernist Debate, WVT, Trier, 1997.

The Spectator as Participant: The Role of Integrating Audience Laughter in Samuel Beckett's Drama
M. Tönnies, Forum Modernes Theater 11 (1996) 185–196.