These literary strata probably represent independent documents. They are usually referred to as J (the Jahwist/Yahwist source), E (the Elohist source), JE (J combined with E), D (the core of Deuteronomy) and P (the Priestly source). See Baruch J. Schwartz, “What Really Happened at Mount Sinai?” BR 13:05; Richard E. Friedman, Who Wrote the Bible? (New York: Summit, 1987), and “Torah (Pentateuch),” in The Anchor Bible Dictionary (New York: Doubleday, 1992), vol. 6, pp. 605–622.