Birger Gerhardsson, “Memory, Tradition and Transmission in Early Christianity,” Acta Seminarri Neotestamentici Upsaliensis 22 (Lund, Sweden: C.W.K. Gleerup, 1964), pp. 160–161. For further details see Alan Millard, Reading and Writing in the Time of Jesus (New York: New York Univ. Press, 2000).