1. Ahler, S. A., 1993, Plains Village Cultural Taxonomy for the Upper Knife-Heart Region. In The Phase I Archaeological Research Program for the Knife River Indian Villages National Historic Site, Part IV: Interpretation of the Archaeological Record, edited by T.D. Thiessen, pp. 57–108. Midwest Archaeological Center Occasional Studies in Anthropology No. 27, National Park Service, Midwest Archaeological Center, Lincoln, NE.
2. Al Chalabi, M. M., and Rees, A. I., 1962, An Experiment on the Effect of Rainfall on Electrical Resistivity Anomalies in the Near Surface, Bonner Jahrbücher 162:226–271.
3. Aspinall, A., and Crummett, J. G, 1997, The Electrical Pseudo-Section. Archaeological Prospection 4:37–47.
4. Avery, T. E., and Berlin, G. L., 1985, Fundamentals of Remote Sensing and Airphoto Interpretation, 5th ed. Macmillan, New York.
5. Becker, H., 1995, From Nanotesla to Picotesla - A New Window for Magnetic Prospecting in Archaeology. Archaeological Prospection 2:217–228.