スティーブン・ペッパー
Duncan, Elmer H.(1970). Stephen C. Pepper: A bibliography. The Journal of Aesthetics and Art Criticism, 28(3), 287-293.
Efron, A. (1980). Pepper's continuing value: In A. Efron & J. Herold (Eds.), Root metaphor: The live thought of Stephen C. Pepper. Paunch, No. 53-54, 5-53.
Pepper, S. C. (1942). World hypotheses: A study in evidence. Berkeley, CA: University of California Press.