dretske, snyder - causal irregularity

F.I. Dretske, A. Snyder. "Causal Irregularity", Philosophy of Science (1972), Vol. 39, No. 1, pp. 69-71.

collingwood - an essay on metaphysics

R.G. Collingwood "Causation" // M. Brand (ed.) "The Nature of Causation". Urbana, Chicago, London: University of Illinois Press, 1976, pp. 169-211.

From "An Essay on Metaphysics". Oxford: Clarendon Press, 1940, pp. 285-327.