1. Beck U. Risk society: towards a new modernity. Los Angeles: Sage; 1992. [1986].
2. Hyslop J. The Inka road system. Orlando: Academic; 1984.
3. Smith ML. Networks, territories and the cartography of ancient states. Ann Assoc Am Geogr. 2005;95(4):832–49.
4. Smith ML. From city walls to country forts: changing landscape intentions of social complexity from the early historic to medieval eras in the Indian subcontinent. In: Billman BR, editor. Warfare and the origins of political control. Tucson: University of Arizona Press; n.d.
5. Fass V. The forts of India. Calcutta: Rupa and Co.; 1986.