diff --git a/README.md b/README.md
index fde767a..973f04f 100644
--- a/README.md
+++ b/README.md
@@ -27,3 +27,5 @@ See [Configuration Reference](https://cli.vuejs.org/config/).
 ### References
 - https://natureofcode.com/book/chapter-7-cellular-automata/
 - https://en.wikipedia.org/wiki/Hashlife
+- https://plato.stanford.edu/entries/cellular-automata/supplement.html
+- https://www.conwaylife.com/wiki/Cellular_automaton