Publications of Place that refer to Ryle (1958). A puzzling element in the notion of thinking.

Place, U. T. (1974-03-20). Lecture 20: Mental events, mental acts and imageless thoughts.(20/3/1974). Section 5
Mental events as the interface between a process and a state. Imageless thoughts. Our knowledge of our own mental events. The symbolic nature of thought
Download: Amsterdam lecture 20

Place, U. T. (1983d). Skinner's Verbal Behavior IV - how to improve Part IV, Skinner's account of syntax. Behaviorism, 11, 163-186.
[References]  [7 referring publications by Place]  
Download: 1983d Skinner's Verbal Behavior IV - How to Improve Part IV - Skinner's Account of Syntax.pdf