Updates references

diff --git a/references.md b/references.md
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@@ -5,6 +5,7 @@
 * [Debian New Maintainers' Guide](https://www.debian.org/doc/manuals/maint-guide/).
 * [Debian Developer's Reference](https://www.debian.org/doc/manuals/developers-reference/)
 * [Debian Policy Manual](https://www.debian.org/doc/debian-policy/).
+* [Guide for Debian Maintainers](https://www.debian.org/doc/manuals/debmake-doc/index.en.html)
 * [Overview — Ubuntu Packaging Guide](http://packaging.ubuntu.com/html/).
 * [Debugging Debian package installations](http://mdcc.cx/debian/debugging_debian_package_installations.html).
 * [Quick Debian development guide - anarcat](https://anarc.at/software/debian-development/ "Quick Debian development guide - anarcat")
@@ -56,3 +57,10 @@
   * [How can I Debian-package a python application with a systemd unit using stdeb3/py2dsc and dpkg-buildpackage? - Stack Overflow](https://stackoverflow.com/questions/64345965/how-can-i-debian-package-a-python-application-with-a-systemd-unit-using-stdeb3-p "How can I Debian-package a python application with a systemd unit using stdeb3/py2dsc and dpkg-buildpackage? - Stack Overflow")
   * [packaging - How to package a systemd service? - Ask Ubuntu](https://askubuntu.com/questions/746094/how-to-package-a-systemd-service "packaging - How to package a systemd service? - Ask Ubuntu")
   * [configuration - How do I override or configure systemd services? - Ask Ubuntu](https://askubuntu.com/questions/659267/how-do-i-override-or-configure-systemd-services#659268 "configuration - How do I override or configure systemd services? - Ask Ubuntu")
+
+## SysUser
+
+* [Teams/Dpkg/Spec/SysUser - Debian Wiki](https://wiki.debian.org/Teams/Dpkg/Spec/SysUser)
+* [dh_sysuser(1) — dh-sysuser — Debian testing — Debian Manpages](https://manpages.debian.org/testing/dh-sysuser/dh_sysuser.1.en.html)
+* [Debian / dh-sysuser · GitLab](https://salsa.debian.org/debian/dh-sysuser)
+* [dh-sysuser. Yesterday I’ve discovered a dh-sysuser… | by George Shuklin | OpsOps | Medium](https://medium.com/opsops/dh-sysuser-6bd3e3d623dd)