↑ Richard L. Goerwitz(1996).“The Jewish Scripts”.InPeter T. Daniels; William Bright.The World's Writing Systems.Oxford University Press.p.487.ISBN0195079930
↑ Geoffrey Sampson(1985).Writing Systems.Stanford University Press.p.80.ISBN0804717567
↑ Joseph Naveh(1987)[1982].Early History of the Alphabet(2nd ed.).Hebrew University.p.25.ISBN9652234362