Generally speaking, journal articles are not catalogued in library catalogues.
If you know the journal article details,
search by journal article and author in SOLO Search Everything (note: not comprehensive & doesn't include print journal articles)
search by journal title in SOLO All libraries / collections.
If you don't know the journal article details, use bibliographic databases to find them.
You can find printed bibliographies in a library catalogue by doing a subject search, such as Reformation - Bibliography.
Why bother? Bibliographies specialise in finding articles which have been published in history or history-related journals. Important: Note that these databases tell you what has been published but not what exists in Oxford.
How to you find the full-text? use the button to locate the full-text (print or electronic).