, 2021, Speaking of silence in Heidegger, Lexington Books, Lanham.
with Stafford, S. P. , 2006, 'Heidegger's phenomenology of boredom, and the scientific investigation of conscious experience', Phenomenology and the Cognitive Sciences 5 (2), 155-169.
with Flood, R. L. , 1989a, Systems: past, present, and future, in R. L. Flood, M. C. Jackson & P. Keys (eds.), Systems prospects, Dordrecht, Springer, pp. 55-60.