"The seal impressions, from various tombs, date even further back, to 3400 B.C. These dates challenge the commonly held belief that early logographs, pictographic symbols representing a specific place, object, or quantity, first evolved into more complex phonetic symbols in Mesopotamia." Mitchell, Larkin. "Earliest Egyptian Glyphs". Archaeology. Archaeological Institute of America. பார்க்கப்பட்ட நாள் 29 February 2012.
