diff --git a/data_structures/skip_list.cpp b/data_structures/skip_list.cpp
index 6159506a0..515c6d138 100644
--- a/data_structures/skip_list.cpp
+++ b/data_structures/skip_list.cpp
@@ -5,7 +5,7 @@
  * A skip list is a data structure that is used for storing a sorted list of items with a
  * help of hierarchy of linked lists that connect increasingly sparse subsequences of the items
  * 
- * References used: GeeksForGeeks skip list code, https://iq.opengenus.org/skip-list/  PseudoCode and Code
+ * References used: [GeeksForGeek](https://www.geeksforgeeks.org/skip-list/), [OpenGenus](https://iq.opengenus.org/skip-list) for PseudoCode and Code
  * @author enqidu
  * .
 */