The ISSN is displayed in two groups of four digits, separated by a hyphen and preceded by the acronym ISSN. For example:
ISSN 0251-1479
ISSN 1050-124X
This identifier must be displayed on each part-unit of the serial publication.
If a barcode is used, both identifiers (barcode and numeric code) must figure in the publication.
The ISSN is placed in the different types of publications as follows:
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in newspapers, in the masthead or the colophon, among the imprint data;
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in periodicals, yearbooks and other periodical publications, in the upper right corner of the cover or the title-page, or in the colophon, among the imprint data;
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in the case of publications belonging in series, near the series title (on the title-page, endleaf, cover) or in the colophon, among the imprint data;
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in the case of a non-print medium, on the parts of the publication visible to the naked eye; in the case of electronic publications on the homepage.