Certain complicated collections of reference sources can arise in our projects. Because cutting edge research is usually led by a few specialized researchers, you may often find sources with overlapping or identical authors. We might have multiple articles by the same authors, multiple articles with the same lead author, or articles by the same author published in the same year. How do we decide which goes first in the references page? The sorting priorities are (a) author, (b) publication time, (c) title. Use the following chart to sort out commonly confusing entries.