The J(ahwist) and E(lohist) sources were so named because in the narratives in Genesis attributed to them God is called Yahweh and Elohim respectively. The D(euteronomist) gets its name from the Book of Deuteronomy—though portions of the books of Joshua through Kings are also attributed to this source. The P(riestly) source is named for the interest it has in matters of concern to priests.