In our commentary on this excellent set of articles on "Sourcing in the Reading Process," we endeavor to synthesize the findings from the seven articles and discuss future research. We discuss significant contributions related to source memory, source evaluation, use of sources in action and belief, integration of information from multiple sources, and instruction in sourcing. Next we discuss several issues for future research raised by these articles, including expert sourcing, embedded sources, epistemic justice, and explanations of disagreement. Finally, we argue that the credibility of sources and their claims is determined by the reliability of the processes used by the sources to produce their claims. Our focus on the reliability of processes used by sources has implications for understanding sourcing processes, for evaluating normative claims about which sources are most reliable, for explaining how people evaluate sources, and for developing instruction on sourcing.