Box 58Both a date of update and a date of revision

Various words are used to show that the content of a book has been changed. Among them are: updated, modified, revised, reviewed.

  • Use the wording supplied in the book
  • Give all words expressing update/revision with the dates provided, in ascending date order
  • Enter dates in the format year month day
  • Separate words with their dates by a semicolon and a space
    • updated 2006 May; modified 2006 Dec;
    • revised 2005 Dec; updated 2006 Mar;
  • Add the date of citation and put all date information in square brackets
  • End date information with a period placed outside the closing bracket
    • Are you worried about... cancer? [Internet]. London: Cancerbackup; c2003 [reviewed 2004 Sep 1; modified 2006 Aug 17; cited 2006 Nov 3]. [about 5 screens]. Available from:

From: Chapter 22, Books and Other Individual Titles on the Internet

Cover of Citing Medicine
Citing Medicine: The NLM Style Guide for Authors, Editors, and Publishers [Internet]. 2nd edition.
Patrias K, author; Wendling D, editor.
Bethesda (MD): National Library of Medicine (US); 2007-.

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