Update references

README.md

@@ -4,8 +4,12 @@ Ext4 implementation from scratch
 
 ## Disclaimer
 
-> This software tries to read raw bytes from your input. Any damage done to the files will not be my responsibility. Use at your own risk
+> This software tries to read raw bytes from your input file. Any damage done to the files will not be my responsibility. Use at your own risk
 
 ## Demo
 
 ![Demo](./demo.gif)
+
+## References
+- https://docs.kernel.org/filesystems/ext4/
+- https://www.sans.org/blog/understanding-ext4-part-6-directories/