United Nations Editorial Manual Online
Footnotes and other references
V. Repeated references
A reference is given the first time that a source or item is mentioned in the text. In resolutions, a reference is given once only, the first time that an item is mentioned, whether in the preamble or in the operative part. Once a reference has been given, it is repeated only when necessary for the sake of clarity or to change a specific element in the reference, such as a section or paragraph number.
A. Repeated footnote references
In a change from past practice, numbered footnote indicators are no longer repeated in resolutions. When a reference must be repeated, a new footnote with the identical text should be inserted.
Repeated footnote indicators may be used in explanatory footnotes. This is the practice, for example, in the preliminary list of items for inclusion in the agenda of the General Assembly, the provisional agenda and the draft agenda (see e.g. A/BUR/72/1, para. 88), where the same explanatory footnote applies to several items:
In documents and publications, it is preferable to avoid repeated indicators and to use a shortened version of the original reference in a new footnote (see Shortened references below).
Repeated footnotes indicated by asterisks and other symbols. When asterisks and other symbols are used as footnote indicators in a list or table of contents, the same symbol can be repeated as necessary when the footnote applies to more than one item. The footnote itself need not be repeated.
"Ibid." (the abbreviation for "ibidem", meaning "in the same place") refers to the work cited in the preceding footnote or to the preceding work within the same footnote. The term should not be used when the preceding footnote includes more than one source.
"Ibid." is used when repeat footnote indicators are not used and to replace those elements that are identical in the preceding footnote or the preceding work within the same footnote. It is never used solely to replace the name of an author. When different works by the same author are cited in consecutive footnotes, the author’s name is repeated in full each time.
"Ibid." may be used to replace document symbols in text notes when the document symbol is repeated and no other references intervene.
In documents and publications, once a reference has been given in full, a shortened form can be used when the same source is cited again in non-consecutive footnotes. The abbreviations "op. cit." and "loc. cit." are not used.
The shortened reference should include:
When the footnotes are widely separated, a cross reference to the original footnote may also be included.
For works without an author, the shortened title alone is sufficient.
Source notes. In tables and figures, references to sources are normally given in full (see Tables/Notes to tables). When the same general source is used repeatedly for a series of tables, a shortened reference and a cross reference to the first table containing the full reference can be given in the source note. "Ibid." should not be used to refer to a source in a previous table.
Footnotes within tables and figures. Footnote indicators are repeated within a given table or figure after every item to which the footnote applies (see Tables/Notes to tables). Lower-case letters are normally used as footnote indicators (see Footnote indicators/Footnotes indicated by lower-case letters).
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