diff --git a/book/source/22-resources.md b/book/source/22-resources.md
deleted file mode 100644
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--- a/book/source/22-resources.md
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@@ -1,23 +0,0 @@
-<!--
-SPDX-FileCopyrightText: 2023 The "Notes on OpenPGP" project
-SPDX-License-Identifier: CC-BY-SA-4.0
--->
-
-# External resources
-
-[OpenPGP version 6 draft specification](https://datatracker.ietf.org/doc/draft-ietf-openpgp-crypto-refresh/) draft-ietf-openpgp-crypto-refresh [2023]
-
-[RFC4880](https://www.rfc-editor.org/rfc/rfc4880.html) OpenPGP Message Format [2007], specifies OpenPGP version 4
-
-(wot-resources)=
-## Web of Trust
-
-[PGP Web of Trust: Core Concepts Behind Trusted Communication](https://www.linux.com/training-tutorials/pgp-web-trust-core-concepts-behind-trusted-communication/),
-[PGP Web of Trust: Delegated Trust and Keyservers](https://www.linuxfoundation.org/blog/pgp-web-of-trust-delegated-trust-and-keyservers/) [Konstantin Ryabitsev, 2014]
-
-[OpenPGP Web of Trust](https://sequoia-pgp.gitlab.io/sequoia-wot/) [Neal Walfield, 2022];
-implementation: <https://gitlab.com/sequoia-pgp/sequoia-wot/>.
-
-## GnuPG
-
-[An Advanced Introduction to GnuPG](https://gnupg.org/ftp/people/neal/an-advanced-introduction-to-gnupg/openpgp/openpgp.pdf) [Neal Walfield, 2017]
diff --git a/book/source/index.md b/book/source/index.md
index 60d6af8..234ccca 100644
--- a/book/source/index.md
+++ b/book/source/index.md
@@ -41,7 +41,6 @@ zoom/private_keys.md
 zoom/signatures.md
 zoom/encyption.md
 
-22-resources.md
 23-glossary.md
 24-acknowledgements.md
 a-artifacts.md