diff --git a/References.md b/References.md
index 1a3f2c9..88f658b 100644
--- a/References.md
+++ b/References.md
@@ -1,4 +1,6 @@
 * https://elvischidera.com/2022-04-29-philosphy-software-design
 * https://www.cantorsparadise.com/what-is-risk-a-mathematical-approach-e4b4e76fbf06
 * https://www.pathsensitive.com/2022/03/abstraction-not-what-you-think-it-is.html
-* https://austinhenley.com/blog/teenytinycompiler1.html
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+* https://austinhenley.com/blog/teenytinycompiler1.html
+* https://en.algorithmica.org/hpc/data-structures/s-tree/
+* https://en.wikipedia.org/wiki/RocksDB
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