1. Babcock, Barbara., ed. The Reversible World: Symbolic Inversion in Art and Society. Ithaca, NY: Cornell UP, 1972.
2. Too Many, Too Few;Babcock;Semiotica,1978
3. Bock, Frank George. A Descriptive Study of the Dramatic Function and Significance of the Clown During Hopi Indian Public Ceremony. Diss. U of Southern California, 1971.