Sources

Every timeline on TimelineSphere is built on research. This page explains the types of references we draw on and how we use them.

Reference material

• Established encyclopedias and reference works.
• Academic and institutional publications.
• Reputable museums, archives, and historical societies.
• Well-regarded books and biographies for narrative context.

Per-timeline sources

Many timelines include a dedicated “Sources” section listing the references most relevant to that story. Where present, you’ll find it among the expandable sections on the timeline page.

How we use sources

We cross-check key dates and facts across multiple references and favour widely accepted scholarship. Our broader standards are described in our Editorial Policy.

Suggest a source

If you can point us to a better or primary source for a timeline, we’d be grateful — reach out through the Contact page.