Bluebook Guide: Short Form Citation

Like other materials, once a periodical piece has been cited in full, id. or supra may refer to it in subsequent citations.  See R16.9, pp. 167-69.

The Bluebook provides more examples of basic citation forms for various periodicals for academic legal writing at R16.1, pp. 157-58, and for court documents at B16, pp. 23-25.  Also, there are some examples on The Bluebook's Quick Style Guide.

To use id.:

• Id. may be used when the work cited is the same as the immediately preceding authority within the same footnote
• Or as the sole authority within the immediately preceding footnote 
• Also provide any difference in page number

To use supra:

• Include the author’s last name before supra
• If there is no author, use the title of the piece or the designation of the piece (if listed before or instead of a title)
• When the first citation to the work uses a hereinafter form, then use the hereinafter form in place of the author’s name, the title, or the designation
• Indicate the footnote in which the full citation appears unless the full citation is in the same footnote, if so, supra may be used without a footnote reference
• To use a supra form, always give the page(s) cited except when citing the work in its entirety

Use the normal short form citation appropriate for the source for materials available only online.  A URL does not need to be repeated after a full citation.

As always, The Bluebook is replete with relevant short form citation examples.  See R16.9, pp. 167-69.