Re-query the paper's DOI in Crossref to retrieve the deposited volume and issue fields, then update the reference manager entry and check the corrected fields against the publisher's landing page. Crossref returns the metadata deposited for that DOI, so the volume and issue it reports come from the record the publisher supplied.
- Copy the DOI from the existing entry. Use the DOI already stored in your reference manager rather than retyping the title, which avoids matching a different paper with a similar title.
- Look up that DOI in Crossref. A DOI lookup returns the deposited metadata for that DOI, including the volume and issue fields when the publisher deposited them. If the response lacks volume or issue, the deposit itself may not include those fields; treat the gap as unresolved and continue to step 4.
- Update the reference manager entry. Enter the retrieved volume and issue into the existing item so the citation key and attached files stay linked to the same record.
- Verify against the landing page. A DOI resolves through the Handle System to current information supplied for the object, commonly a landing page maintained by the registrant. Compare the volume and issue shown there with the values you entered.
If the Crossref response and the landing page disagree, note both values and check which one matches the version you actually read, such as a print issue or an online-first version. Use that comparison to decide which value belongs in the entry.
For a standalone PDF that imported without a parent item, Zotero can attempt to create a parent bibliographic item using identifiers or extracted metadata; check and correct the resulting record, including volume and issue, using the DOI lookup and landing page above.