Id.

Id. (Latin, short for "idem", "the same") is the term used in legal citations for the previously cited source (cf. ibid). It is also used in academic citations where it replaces the name of a repeated author.

Legal example

*United States v. Martinez-Fuerte, 428 U.S. 502 (1976)
*"Id." at 523.

The reference to "U.S. v. Martinez-Fuerte" is in both but that page is different.

Academic example

*Macgillivray, J. A. "Minotaur: Sir Arthur Evans and the Archaeology of the Minoan Myth". New York: Hill & Wand, 2000.
*Id. "Astral Labyrinth : Archaeology of the Greek Sky". Sutton Pub, 2003.

ee also

*Bibliography
*Ibid. ("ibidem")
*Supra
*Infra