Houston, Stephen; Baines, John; Cooper, Jerrold (2003). "Last Writing: Script Obsolescence in Egypt, Mesopotamia, and Mesoamerica". Comparative Studies in Society and History. 45 (3). Cambridge University Press: 441–444. doi:10.1017/S0010417503000227. ISSN0010-4175. JSTOR3879458.
Houston, Stephen; Baines, John; Cooper, Jerrold (2003). "Last Writing: Script Obsolescence in Egypt, Mesopotamia, and Mesoamerica". Comparative Studies in Society and History. 45 (3). Cambridge University Press: 441–444. doi:10.1017/S0010417503000227. ISSN0010-4175. JSTOR3879458.
Houston, Stephen; Baines, John; Cooper, Jerrold (2003). "Last Writing: Script Obsolescence in Egypt, Mesopotamia, and Mesoamerica". Comparative Studies in Society and History. 45 (3). Cambridge University Press: 441–444. doi:10.1017/S0010417503000227. ISSN0010-4175. JSTOR3879458.