“Cite at least one primary source (other than the Bible) that discusses your topic and record what you learn.”
Below are 3 strategies with examples for identifying an ancient, non-biblical primary source. For strategies #1 and #2, you are looking for references to Jewish or Greco-Roman writers such as Philo, Josephus, Pliny, Ovid, Plutarch, Seneca, Cicero, etc. The subsequent task is to use that reference to locate the primary text itself in the Loeb Classical Library or elsewhere. Timeline of ancient Greek and Latin writers web page will help to identify ancient Greek and Latin writers in relation to the New Testament.
Strategy #1 - Specialized dictionaries and encyclopedias which often reference primary texts
Strategy #2 - Locate references to the primary texts by searching the secondary literature
Strategy #3 - Direct keyword searches of the primary texts