- Source 1
- Crossref, Crossref REST API · official record · retrieved 08/29/2026 · upstream last modified 08/29/2026
- Licence
- Bibliographic metadata is used with Crossref attribution; item licences remain record-specific. Source: Crossref
- Source 2
- Internet Archive, Open Library, Open Library APIs and data · official record · retrieved 08/29/2026 · upstream last modified 08/29/2026
- Licence
- Open Library records may combine sources; record-level provenance and applicable rights statements are retained. Source: Open Library, an Internet Archive project.
- What we add
- We compute Vuga Group, Change Status, Recency Days, Public Significance Score using the documented compute method. · methodology