diff --git a/tutorial_files/part1.textile b/tutorial_files/part1.textile
index c1d249e..2119222 100644
--- a/tutorial_files/part1.textile
+++ b/tutorial_files/part1.textile
@@ -279,5 +279,6 @@ h3. Further References
 http://www.w3schools.com/sql/sql_intro.asp
 http://www.firstsql.com/tutor.htm
 https://hackr.io/tutorials/learn-sql
+https://www.scaler.com/topics/sql/
 
 <a rel="license" href="http://creativecommons.org/licenses/by-nc-nd/3.0/"><img alt="Creative Commons License" style="border-width:0" src="http://i.creativecommons.org/l/by-nc-nd/3.0/88x31.png" /></a><br /><span xmlns:dct="http://purl.org/dc/terms/" href="http://purl.org/dc/dcmitype/Text" property="dct:title" rel="dct:type">A Gentle Introduction to SQL Using SQLite</span> by <a xmlns:cc="http://creativecommons.org/ns#" href="https://github.com/tthibo/SQL-Tutorial" property="cc:attributionName" rel="cc:attributionURL">Troy Thibodeaux</a> is licensed under a <a rel="license" href="http://creativecommons.org/licenses/by-nc-nd/3.0/">Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License</a>.