Which short form correctly cites information from Katzenbach v. McClung on page 294 of the United States Reports, without repeating the case name in text?

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The key idea is how to refer back to a case without repeating its full title: use a short form that relies on a distinctive party name from the case and include a pinpoint to the exact page. For Katzenbach v. McClung, the concise way to cite the specific page is “McClung, 379 U.S. at 294.” This identifies the case by the party name that most clearly distinguishes the decision in ongoing text and points to the exact page where the information appears.

Why this is best: it avoids repeating the full case name and uses the standard pinpoint format (the volume, the reporter, and the page preceded by “at”). The other formats fail for technical reasons: omitting “at” or using the full case name again breaks the short-form convention, and inserting extraneous notation like a parenthetical (d) or repeating Katzenbach v. McClung in full creates redundancy or confusion.