1. Fritz Heider (1987). Methods, Principles, and Philosophy of Science. Psychologie Verlags Union.
     
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  2. Lewis White Beck, Fritz Heider & Aron Gurwitsch (1947). Remarks on Gurwitsch's "the Object of Thought". Philosophy and Phenomenological Research 7 (3):353-356.
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  3. Fritz Kaufmann & Fritz Heider (1947). On Imagination. Philosophy and Phenomenological Research 7 (3):369-375.
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