The issue or edition in which the article or paper appeared.
For articles or papers, you may also use up to 40 pages from a publication, provided that this is a maximum of 20% of the original publication. By ‘original publication’ we mean: the number / issue / edition of the journal.
For example: You want to use an article from journal X (volume 10, number 1). That particular edition has 60 pages, so you can use a maximum of 12 pages, as that is 20% of the original publication. This ‘reuse’ has been bought off by your university.
NB: In some journals the page numbering continues throughout the year. In this case, you can take the number of pages of the edition in which the article/paper appeared.
For journals where the page numbering continues throughout the year, the number of pages in the edition in which the article/paper appeared is leading.