* Lewis, Michael (2000b), "Theoretical Hydraulics, Automata, and Water Clocks", in "Wikander, Örjan, "Handbook of Ancient Water Technology", Technology and Change in History, 2, Leiden, pp.
* Lewis, Michael (2000b), «Theoretical Hydraulics, Automata, and Water Clocks», in "Wikander, Örjan, "Handbook of Ancient Water Technology", Technology and Change in History, 2, Leiden, pp.