@inbook {,
	title = {Trace element analysis and the archaeoogical study of obsidian procurement in Precolumbian Mesoamerica},
	booktitle = {Lithics and Subsistence: The analysis of stone tool use in prehistoric economies},
	series = {Vanderbuilt University Publications in Anthropology},
	volume = {20},
	year = {1978},
	publisher = {Vanderbuilt},
	organization = {Vanderbuilt},
	address = {Nashville, TN.},
	author = {Zeitlin, Robert N. and Heimbuch, R. C.},
	editor = {Davis, D. D.}
}