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Bill Powers
Powers (1978) in Psychological Review – Evidence for PCT over Stimulus-Response approaches
“Quantitative Analysis of Purposive Systems: Some Spadework at the Foundations of Scientific Psychology“ William T. Powers Psychological Review, 1978, Vol. 85, No. 5, 417-435

Other
Principles for Intelligent Human-Computer Interaction
Martin Taylor (1992) Principles for intelligent human-computer interaction: a tutorial on layered protocol theory., DCIEM Report 93-32, Dept. Nat. Defence Canada.

Books
Principles-Based Counselling and Psychotherapy
A Method of Levels approach
Timothy A. Carey, Warren Mansell, and Sara J. Tai 2015, Routledge. ISBN 9780415738781 Book Description Many current approaches to the treatment of psychological problems focus on specific disorders and techniques that are purported to be […]