Pilon, Juliana Geran. “Lockeian Roots of the Ontological Principle.”  Process Studies 7, no. 3 (Fall 1977):  192-200.  

Abstract

Locke’s view of causality and the relationship between object and subject are similar to Whitehead’s views.  Both Locke and Whitehead see perception and causality as the aspects of the same process. [Abstract from The Philosopher’s Index]