Valastro, S., Jr., E.M. Davis, A.G. Varela, and S.V. Lisk 1988 University of Texas at Austin Radiocarbon Dates XVI. Radiocarbon 30:221.
Valastro, S., Jr., E.M. Davis, A.G. Varela, and S.V. Lisk 1988 University of Texas at Austin Radiocarbon Dates XVI. Radiocarbon 30:221.