Edward Y. Kutscher, A History of the Hebrew Language, ed. Raphael Kutscher (Jerusalem: Magnes Press, 1982), pp. 87–93. See also the cautious remarks of Isaac Rabinowitz, “The Qumran Hebrew Original of Ben Sira’s Concluding Acrostic on Wisdom,” “Hebrew Union College Annual” 42 (1971), pp. 173–174.