diff --git a/README.md b/README.md
index e3caf3d..7a7d444 100644
--- a/README.md
+++ b/README.md
@@ -29,7 +29,8 @@ Contributions are always welcome!
 * [The Clean Architecture - Robert C. Martin (Uncle Bob)](https://8thlight.com/blog/uncle-bob/2012/08/13/the-clean-architecture.html)
 * [CAP Theorem and Trade-offs](http://robertgreiner.com/2014/08/cap-theorem-revisited/)
 * [CAP Twelve Years Later: How the "Rules" Have Changed (2012) - Eric Brewer (VP of Infrastructure at Google)](https://www.infoq.com/articles/cap-twelve-years-later-how-the-rules-have-changed)	
-* [Scaling Up and Scaling Out](https://blogs.technet.microsoft.com/admoore/2015/02/17/scaling-out-vs-scaling-up/)
+* [Scale Up or Scale Out, What it is and Why You Should Care](https://www.brianjgraf.com/2013/05/17/scalability-scale-up-scale-out-care/)
+* [Scaling Up vs. Scaling Out: Hidden Costs](https://blog.codinghorror.com/scaling-up-vs-scaling-out-hidden-costs/)
 * [ACID and BASE](https://neo4j.com/blog/acid-vs-base-consistency-models-explained/)
 * [Blocking/Non-Blocking and Sync/Async](https://blogs.msdn.microsoft.com/csliu/2009/08/27/io-concept-blockingnon-blocking-vs-syncasync/)
 * [Why Non-Blocking?](https://techblog.bozho.net/why-non-blocking/)