Peet, S. D. American Antiquarian, vol. 28, pp. 213 ff. 1906.
Smith, H. I. Wisconsin Archeologist, vol. 6, pp. 20 ff. 1906–07.
Willoughby, C. C. American Anthropologist, vol. 9, pp. 73 ff. 1907.
Mead, C. W. Peruvian Mummies, p. 15. 1907.
Copper Tablets.
Thomas, C. American Anthropologist, vol. 4, p. 245. 1891.
McGuire, J. G. American Anthropologist, vol. 5, p. 175. 1892.
Thruston, G. P. American Antiquarian, vol. 14, p. 96. 1892.
Cradles.
Mason, O. T. Report of the United States National Museum, 1887, pp. 161 ff. 1887.