1. Asgari A (2004) Achaemenids used sealing for water canals. Cultural Heritage News Network,
http://www.chn.ir/News/?section=2&id=15721
, Cited 19 Dec 2004
2. Calmeyer P (1980) Textual sources for the interpretation of Achaemian palace decoration. Iran 18:53–63
3. Feiz-Khah M (2004) Exploring water supply canal in Persepolis. Cultural Heritage News Network,
http://www.chn.ir/News/?section=2&id=27775
, Cited 24 May 2004
4. Ghirshman R (1961) Iran from the earliest times to the islamic conquest. Penguin Books, Original from the University of California, 368 pp
5. Ibn-Khaldûn I (2005) The Maqaddimah, an introduction to history. Transl. F. Rosenthal, Princeton, NJ: Princeton University Press, 465 pp