World Hypotheses: A Study in Evidence. Bulletin of the Psychonomic Society, 22(5), 446-448.
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* Pepper, S. C. (1942). World hypotheses: A study in evidence. Berkeley, CA: University of California Press.

Extensions and applications

* Efron, A. (Ed.). (1982). The Pepper papers, a symposium on the meta-philosophy of Stephen C. Pepper: Root metaphor theory (Special issue). Journal of Mind and Behavior, 3(3 & 4).
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* Harris, Maxine, Fontana, A. F., & Downs, B. N. (1977). The World Hypotheses Scale: Rationale,

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