Books on Amazon
Causation/Observation/Quantum Theory/Feyerabend: Einstein, Podolski, Rosen/EPR: Analysis by Bohr: There are changes which are not the result of a causal effect of the observer on the object, but a change in conditions: e.g. if a rubber band A is stretched, the truth value of the statement "rubber band A is shorter than rubber band B" changes from true to false without effects taking place between A and B.
Wider den Methodenzwang Frankfurt 1997
Erkenntnis für freie Menschen Frankfurt 1979