diff --git a/book/credits.md b/book/credits.md
index 7f04a41..b934ead 100644
--- a/book/credits.md
+++ b/book/credits.md
@@ -52,6 +52,7 @@ The following pages are included directly from an external resource and is not e
 - Page [](./external/Sphinx-TUDelft-theme/README.md). Original content licensed under MIT license.
 - Page [](./external/teachbooks-sphinx-tippy/README.md). Original content licensed under MIT license.
 - Page [](./external/template/README.md). Original content licensed under CC BY 4.0 license.
+- Page [](./external/Sphinx-Named-Colors/README.md). Original content licensed under MIT license.
 - Pages [](./external/Useful_python_code/extensionfildownloadreturn.ipynb), [](./external/Useful_python_code/figshrinker.ipynb) and [](./external/Useful_python_code/snippit.ipynb). Original content licensed under BSD 3-Clause license.
 
 The following pages contain content written by others, part of has been reused and/or modified by the TeachBooks Team:
diff --git a/book/references.bib b/book/references.bib
index 6ab40b9..bda464b 100644
--- a/book/references.bib
+++ b/book/references.bib
@@ -125,4 +125,12 @@
   url          = {https://github.com/TeachBooks/Sphinx-launch-buttons},
   year         = {2024},
   note         = {Retrieved December, 2024. BSD-3-Clause.}
+}
+
+@misc{sphinx-colors,
+  author       = {{TeachBooks}},
+  title        = {Sphinx Named Colors},
+  url          = {https://github.com/TeachBooks/Sphinx-Named-Colors},
+  year         = {2024},
+  note         = {Retrieved January 2025. MIT.}
 }
\ No newline at end of file