, 1999, 'Berkeley and scepticism', Philosophy and Phenomenological Research 59 (1), 133-149.
, 1994, 'Perception and mystical experience', Philosophy and Phenomenological Research 54 (4), 877-883.
, 1987a, Berkeley and immediate perception, in E. Sosa (ed.), Essays on the philosophy of George Berkeley, Dordrecht, Springer, pp. 195-213.