diff --git a/README.md b/README.md
index e79dacd..ba95255 100644
--- a/README.md
+++ b/README.md
@@ -132,7 +132,8 @@ _________________
 - [Computer Organization and Design: ARM Edition -  David A. Patterson, John L. Hennessy](https://github.com/AbderrhmanAbdellatif/ComputerOrganization/blob/master/%5BThe%20Morgan%20Kaufmann%20Series%20in%20Computer%20Architecture%20and%20Design%5D%20David%20A.%20Patterson%2C%20John%20L.%20Hennessy%20-%20Computer%20Organization%20and%20Design_%20The%20Hardware%20Software%20Interface_%20ARM%20Edition%20(2016%2C%20Morgan%20Kaufmann).pdf)
 - [Digital Design and Computer Architecture: ARM Edition -  Sarah Harris, David Harris](https://a.co/d/4otoVvI)
 - [Embedded Systems Architecture - Tammy Noergaard](https://www.oreilly.com/library/view/embedded-systems-architecture/9780123821966/)
-
+- [The Definitive Guide to ARM® Cortex®-M0 and Cortex-M0+ Processors - Joseph Yiu](https://www.oreilly.com/library/view/the-definitive-guide/9780128032787/)
+- [The Definitive Guide to ARM® Cortex®-M3 and Cortex®-M4 Processors - Joseph Yiu](https://www.oreilly.com/library/view/the-definitive-guide/9780124080829/)
 _________________
 
 ### Using Test Equipment