Sources: where every fact on this site comes from

This page lists the sources used across the site, grouped by what each one is good for. Our research method is described on the about page.

Primary sources from the rights holder

• Disney Books: The Book of Bill confirms the publisher, author, release date of July 23, 2024, page count of 208, ISBN 9781368092203, and the "Adult" age range for The Book of Bill.
• Disney Books: The Book of Bill Limited Collector's Edition and The Art of Gravity Falls confirm the 2025 collector's edition and the art book.
• Disney Books: Gravity Falls is the publisher's own Gravity Falls imprint page, and the best source for which books exist and who wrote them.
• Disney+ is the streaming home of all 40 episodes and the only authorised source we point readers to for viewing.

Primary statements by the creator

• Alex Hirsch's public posts during July and August 2016, in which he announced the Cipher Hunt, clarified that it was run at his own volition and funding with no affiliation to Disney, and released clues. These are the basis of the clue sequence and the "REEDSPORTOR" solution on our Cipher Hunt page.
• Hirsch's 2022 appearance on the Mystery Shack Lookback podcast, in which he described the circumstances behind the Bradley Pic detail that has circulated in the treasure chest's Stan Bucks.
• The behind-the-scenes documentary One Crazy Summer (July 28, 2018), included with the complete-series box set, in which Hirsch discusses where the Cipher Hunt idea came from.

Reference sources

• Wikipedia: Gravity Falls is our main reference for the series' episode and season counts, broadcast dates, networks, production companies, voice cast, and broadcast history, including the fez symbol edit. It is heavily cited in its own right and we follow its references where a detail matters.
• Wikipedia: The Book of Bill confirms the December 2023 announcement, the July 23, 2024 release, the sixteen credited artists, the ISBNs, and the New York Times Best Seller run from July 2024 to January 2025.
• Wikipedia: Cipher Hunt documents the twelve-plus locations, the cipher methods, and the aftermath including the Confusion Hill relocation. Note that this article carries maintenance flags for relying heavily on primary sources, which is why we corroborate its key dates against Hirsch's own announcements.

Secondary reporting we used for context

• Atlas Obscura, Ars Technica-style technology coverage, and general technology press reported on the Cipher Hunt in real time in 2016.
• Publisher interviews with Alex Hirsch in Polygon, Collider, and Rolling Stone covering The Book of Bill's development, its deliberately older audience, and the Barnes & Noble exclusive edition with sixteen extra pages.

Sources we deliberately do not treat as authoritative

Fan wikis, aggregator sites, and "complete biography" pages are useful for finding leads but are not cited for facts here. Several of them contain confident biographical detail that no primary source supports, and that pattern is exactly what we are trying to avoid.