Sugiyama, S.

Mass human sacrifice and symbolism of the Feathered Serpent Pyramid in Teotihuacan, Mexico

Tempe: Arizona State University Anthropological Research Papers, 1995.

Swenson, E. R.

Cities of Violence: Sacrifice, Power and Urbanisation in the Andes

in: Journal of Social Archaeology , v. 3 (2003), issue 2: pp.256–296.