Format a complete, accurate works-cited page listing every source used, in a simple, consistent citation style.
A works-cited page lists every source used in a report, in alphabetical order by the author's last name, or by the title or organization name when there is no individual author, so a reader can find and check any source. A simple, consistent format for common source types -- books, websites, and encyclopedia entries -- names the author (if any), the title, the publisher or website name, and the date or year.
This matters beyond just following a rule: a complete works-cited page lets a curious reader go deeper into the topic, and it is the final proof that a report's facts came from real, checkable places rather than guesswork.
Mastery looks like: They produce a complete, correctly alphabetized works-cited page in a consistent format that matches every source actually used in the report.
Common stumbles: Leaving off a source that was actually used in the report; alphabetizing by the wrong word or leaving the list in random order.