Undergraduates writing about employment law or gender history often cite court opinions, statutes, and secondary works for the first time. A paper might draw on the text of Title VII, the opinion in Meritor Savings Bank v. Vinson, and Gillian Thomas's Because of Sex as a narrative guide. These sources serve different purposes, and many students treat them as interchangeable. Graders need to assess not just whether sources are present, but whether they are used appropriately.

A primary legal source, such as a Supreme Court opinion, shows what the Court actually said and how it reasoned. A secondary source, such as Thomas's book, interprets and contextualizes that decision, often through the stories of the people involved. Strong papers distinguish between the two and use each for its proper function. A student who cites the book for the Court's holding rather than the opinion itself may be relying on a less authoritative source.

Citation format is another area where students struggle, since legal citation differs from the styles most undergraduates know. Instructors must decide whether to require Bluebook, APA, MLA, or Chicago, and communicate that clearly. Grading citation accuracy can consume time, so decide how much weight it deserves relative to the argument. For most undergraduate courses, consistency and traceability matter more than perfect form.

Evaluate how sources support the argument

The central question in grading a research paper is whether each source does real work in the argument. A paper claiming that courts gradually broadened the meaning of discrimination should cite specific rulings and explain how each moved the law forward. Dropping in a case name without explanation is decoration, not evidence. Look for sentences that explain what a source shows and why it matters.

• Source variety: a reasonable mix of primary legal sources and credible secondary works
• Accuracy: correct description of holdings, statutes, and the facts of each case
• Integration: sources woven into the argument instead of summarized one at a time
• Attribution: clear signals about whose words and ideas belong to whom
• Citation consistency: a single style applied accurately throughout the paper

Catch common misuse of legal sources

Several errors appear again and again. Some students overstate a ruling, claiming that it banned all discrimination when it addressed one narrow issue. Others treat a dissent as though it were the majority opinion or rely on news summaries instead of the opinion itself. Dothard v. Rawlinson, for example, struck down height and weight requirements but upheld a sex-based rule for certain prison jobs, a nuance that careless readers can miss.

Feedback should name the specific misreading and point students to the correct source. A comment such as "check the Court's holding on the bona fide occupational qualification exception" sends the student back to the primary text. This builds research habits that extend beyond the assignment. Students learn that accuracy requires returning to the original document.

Manage grading time on source-heavy papers

Research papers take longer to grade than shorter assignments, particularly when sources must be checked. Instructors cannot verify every citation, so most use a sampling approach, checking a few references per paper and noting patterns. A rubric that specifies what to check and how much it counts keeps this process consistent. Without structure, source checking can expand to fill all available time.

AI-assisted tools can speed up the first pass by flagging unsupported claims, missing citations, and thin integration of sources according to your rubric. You still verify the most important points and apply your subject knowledge. This division of labor reduces the mechanical work and leaves more time for substantive feedback. It is especially valuable in courses with dozens of long papers due at once.

Teach source use before the paper is due

Many problems can be prevented with a short in-class exercise on how to read and cite a court opinion. Give students an excerpt and ask them to identify the holding, the reasoning, and one sentence worth quoting. Then show how to cite it and how to introduce it in a sentence. This small investment pays off with noticeably better papers.

An annotated bibliography assignment earlier in the term can reinforce these skills. Students summarize each source and explain how they plan to use it, giving you an early view of potential problems. Feedback at that stage is easier to give and more likely to change the final paper. By the time the research paper is due, students have practiced the habits you want to see.