1. Abbott, M. B., Binford, M. W., Brenner, M., & Kelts, K. R. (1997). A 3,500 14C yr high-resolution record of water-level changes in Lake Titicaca, Bolivia-Peru. Quaternary Research, 47(2), 169–180.
2. Adams, W. M., & Mortimore, M. J. (1997). Agricultural intensification and flexibility in the Nigerian Sahel. The Geographic Journal, 163(2), 150–160.
3. Allen, M. W. (2008). Hillforts and the cycling of Maori chiefdoms: Do good fences make good neighbors? In J. A. Railey & R. M. Reycraft (Eds.), Global perspectives on the collapse of complex systems. Maxwell Museum of Anthropology: Albuquerque.
4. Arkush, E. N. (2005). Colla fortified sites: Warfare and regional power in the Late Prehispanic Titicaca Basin, Peru. Unpublished Ph.D. dissertation, University of California, Los Angeles.
5. Arkush, E. N. (2011). Hillforts of the ancient Andes: Colla warfare, society and landscape. Gainesville: The University Press of Florida.