J.C. Darnell, “Die fruhalphabetischen Inschriften im Wadi el-Hol,” in Der Turmbau zu Babel, Ursprung und Vielfalt von Sprache und Schrift, vol. 3A (Die Schrift: Vienna and Milano, 2003), pp. 165–171. See also the newest study by O. Goldwasser, “For a Late 12th Dynasty Date of the Proto-Sinaitic Script,” Egypt and the Levant 17 (forthcoming).