Welch, John. 1996. ?The Archaeological Measures And Social Implications Of Agricultural Commitment?. Anthropology. Anthropology. University of Arizona. http://ezproxy.library.arizona.edu/login?url=http://proquest.umi.com/pqdweb?did=739663551&sid=2&Fmt=2&clientId=43922&RQT=309&VName=PQD.