diff --git a/Readme.md b/Readme.md
index b19483a..f342b36 100644
--- a/Readme.md
+++ b/Readme.md
@@ -755,4 +755,10 @@ Finally, when this is done, the user interface shows the graph completely plotte
 
 
 
-[1]: <https://github.com/KrisKasprzak/96_Graphing> "Kris Kasprzak, OLED_Graphing.ino"
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+[1]: <https://github.com/KrisKasprzak/96_Graphing> "Kris Kasprzak, OLED_Graphing.ino"
+[2]: <https://learn.adafruit.com/adafruit-gfx-graphics-library/overview> "Adafruit, Adafruit GFX Graphics Library"
+
+# References
+
+\[1\] [Adafruit][2], Adafruit GFX Graphics Library, URL: [https://learn.adafruit.com/adafruit-gfx-graphics-library/overview](https://learn.adafruit.com/adafruit-gfx-graphics-library/overview)  
+\[2\] [Kasprzak K.][1], OLED_Graphing.ino, URL: [https://github.com/KrisKasprzak/96_Graphing](https://github.com/KrisKasprzak/96_Graphing)
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