August 2017 Navigate up to the English index: index-topical-hb.
Richard Elliot Friedman’s The Bible With Sources Revealed is useful. Of the (admittedly small) amount of stuff I’ve read on the questions surrounding the Documentary Hypothesis, Friedman’s little book is addressed in clear terms to a general audience, and it lays out in a good summary form the various arguments for a roughly traditional understanding of the documentary hypothesis. One of these arguments is the doublets — places where the same material is repeated. For a list of doublets, taken from his book, see here.