Pollock 1992, p. 299 Pollock, Susan[in German] (1992), "Bureaucrats and managers, peasants and pastoralists, imperialists and traders: Research on the Uruk and Jemdet Nasr periods in Mesopotamia", Journal of World Prehistory, 6 (3): 297–336, doi:10.1007/BF00980430, S2CID161700843
Pollock 1992, p. 299 Pollock, Susan[in German] (1992), "Bureaucrats and managers, peasants and pastoralists, imperialists and traders: Research on the Uruk and Jemdet Nasr periods in Mesopotamia", Journal of World Prehistory, 6 (3): 297–336, doi:10.1007/BF00980430, S2CID161700843
Woods 2010, pp. 36–37 Woods, Christopher (2010), "The earliest Mesopotamian writing"(PDF), in Woods, Christopher (ed.), Visible language. Inventions of writing in the ancient Middle East and beyond, Oriental Institute Museum Publications, vol. 32, Chicago: University of Chicago, pp. 33–50, ISBN978-1-885923-76-9
Woods 2010, pp. 44–45 Woods, Christopher (2010), "The earliest Mesopotamian writing"(PDF), in Woods, Christopher (ed.), Visible language. Inventions of writing in the ancient Middle East and beyond, Oriental Institute Museum Publications, vol. 32, Chicago: University of Chicago, pp. 33–50, ISBN978-1-885923-76-9
Woods 2010, p. 39 Woods, Christopher (2010), "The earliest Mesopotamian writing"(PDF), in Woods, Christopher (ed.), Visible language. Inventions of writing in the ancient Middle East and beyond, Oriental Institute Museum Publications, vol. 32, Chicago: University of Chicago, pp. 33–50, ISBN978-1-885923-76-9
Woods 2010, p. 35 Woods, Christopher (2010), "The earliest Mesopotamian writing"(PDF), in Woods, Christopher (ed.), Visible language. Inventions of writing in the ancient Middle East and beyond, Oriental Institute Museum Publications, vol. 32, Chicago: University of Chicago, pp. 33–50, ISBN978-1-885923-76-9
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Pollock 1992, p. 299 Pollock, Susan[in German] (1992), "Bureaucrats and managers, peasants and pastoralists, imperialists and traders: Research on the Uruk and Jemdet Nasr periods in Mesopotamia", Journal of World Prehistory, 6 (3): 297–336, doi:10.1007/BF00980430, S2CID161700843