Home › Authors › William Lawrence Petersen 👤 William Lawrence Petersen b. 1950 ยท 3 books Books by William Lawrence Petersen Sayings of Jesus: Canonical and Non-Canonical 1997 Tatian's Diatessaron 1994 The Diatessaron and Ephrem Syr The Diatessaron and Ephrem Syrus as sources of Romanos the Melodist 1984