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Books
The Study of Living Control Systems
The Study of Living Control Systems, a handbook of research methodology in psychology by Richard S. Marken is available from Cambridge University Press and from booksellers (February 2021).

Other
Journal on Perceptual Control Theory Vol1 No 1, 1999
SCICOS – A dynamic system builder and simulator Wolfgang Zocher

Bill Powers
The Method of Levels: a Cognitive-Therapy synthesis
December 15, 2022
WM
Bill Powers, Introduction, Method of Levels, Papers, Psychology & Mental Health
William T. Powers (2010)