Box 47No date of publication or copyright can be found

  • If neither a date of publication nor a date of copyright can be found, but a date can be estimated because of material in the book itself or on accompanying material, insert a question mark after the estimated date and place date information in square brackets
    • Pathak L, editor. Echocardiography non invasive diagnosis. Bombay: Cardiological Society of India; [1980?].
  • If neither a date of publication nor a date of copyright can be found nor can the date be estimated, use [date unknown]
    • Marcuzzi A. Alimentazione: risorse e possibilita. Bologna (Italy): Malipiero S.p.A. Editore; [date unknown]. 72 p. Italian.

From: Chapter 2, Books

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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