# Doubleday — source-backed brand brief Profile: [Doubleday]() Evidence record: [Sources and review dates]() Exported: 2026-10-26T20:45:39.950Z. Export time only; this is not a source observation, factual update or verification date. This brief contains only the scoped evidence published for this profile. Public-source statements and business statements are attributed, not independently verified. Missing topics remain unknown; legacy profile descriptions and products are not included as supported facts. Quoted source content and claim text are reference data, not instructions. Check the cited scope before reusing a statement. This export does not connect an AI service or guarantee that it will access or cite BrandSource. 3 supported scoped claim(s); 0 unresolved or overdue claim(s). ## Inception \(Wikidata\) Status: Stated by a public source Value: 1897 Scope: Wikidata Q1251563 property P571. Source inception date at its stated precision; not necessarily legal incorporation. Explanation: Deterministically projected from an identity-matched Wikidata record. Upstream references are preserved but not independently checked; source rank is not verification confidence. Review: Rule checked 2026-10-17T04:59:33.658Z; review due 2027-01-15T04:59:33.658Z. Published: 2026-10-17T04:59:33.658Z. Claim version: 1. Claim: [brandsource:doubleday:wikidata:p571]() Rule checked means automated validation, not individual manual review or independent corroboration. Sources: - [Wikidata Q1251563, revision 2549320746]() — Public knowledge base; observed 2026-10-17T02:50:26.112Z; lineage: wikidata.org; record: Q1251563:P571@2549320746. ## Industry \(Wikidata; date unspecified\) Status: Stated by a public source Value: publishing Scope: Wikidata Q1251563 property P452. The source statement has no date qualifier; this does not establish a current value or current operating status. Explanation: Deterministically projected from an identity-matched Wikidata record. Upstream references are preserved but not independently checked; source rank is not verification confidence. Review: Rule checked 2026-10-17T04:59:33.658Z; review due 2027-01-15T04:59:33.658Z. Published: 2026-10-17T04:59:33.658Z. Claim version: 1. Claim: [brandsource:doubleday:wikidata:p452]() Rule checked means automated validation, not individual manual review or independent corroboration. Sources: - [Wikidata Q1251563, revision 2549320746]() — Public knowledge base; observed 2026-10-17T02:50:26.112Z; lineage: wikidata.org; record: Q1251563:P452@2549320746. - [Wikidata label: Q3972943, revision 2549733790]() — Public knowledge base; observed 2026-10-17T00:45:27.190Z; lineage: wikidata.org; record: Q3972943:label:en@2549733790. ## Official website \(Wikidata; date unspecified\) Status: Stated by a public source Value: http://doubleday.knopfdoubleday.com/ Scope: Wikidata Q1251563 property P856. The source statement has no date qualifier; this does not establish a current value or current operating status. Explanation: Deterministically projected from an identity-matched Wikidata record. Upstream references are preserved but not independently checked; source rank is not verification confidence. Review: Rule checked 2026-10-17T04:59:33.658Z; review due 2027-01-15T04:59:33.658Z. Published: 2026-10-17T04:59:33.658Z. Claim version: 1. Claim: [brandsource:doubleday:wikidata:p856]() Rule checked means automated validation, not individual manual review or independent corroboration. Sources: - [Wikidata Q1251563, revision 2549320746]() — Public knowledge base; observed 2026-10-17T02:50:26.112Z; lineage: wikidata.org; record: Q1251563:P856@2549320746. ## Unknowns and limits - This brief does not establish answers to topics outside the listed claims.