The cover of a book consists of four pages referred to as the front cover, the inside front cover, the inside back cover and the back cover. If the book is thick enough the title should be printed on the spine, reading downwards. The type size used must be in proportion to the width of the spine.
The front cover carries the name and emblem of the editor, the title of the publication and, if appropriate, the subtitle and the name of the author (particularly in the case of co-editions).
The inside front cover remains blank.
The inside back cover carries a publicity notice.
The back cover shows the selling price, if applicable, the Publications Office emblem, the ISBN (international standard book number), also printed in the form of a bar code, and the catalogue number.
Price (excluding VAT) in Luxembourg: EUR …
In serial publications, the ISSN (international standard series number) is included with the aforementioned items. It is printed in the top right-hand corner of the front cover.
It should be noted that some periodicals have no cover as such. In these cases, the title of the periodical, along with the number and year, must appear on the front cover. In some cases, the inside front cover and the inside back cover are used for a summary of the contents. The yearly publication cycle should coincide with the calendar year.
The prices (subscription and individual issues) are given on the back cover, together with the catalogue number and the Publications Office emblem.