- Hoebel, E.A. (1966). Anthropology (3rd ed.). University of Minnesota: USA. P.76. "... the diffusion of the ancient East Indian game of pachisi into prehistoric America, where it appeared among the Aztecs as patolli and in various other forms among other Indians."
- Lewis, R. B. (1988). Old World dice in protohistoric United States. In Current Anthropology. 29(5) pg.766