diff --git a/documents/references.md b/documents/references.md
index 7a613a2486ff679beca52e15b236b9730e8bac22..f36120a83e9804d54428ca1dd95d5dad1e59ee9c 100644
--- a/documents/references.md
+++ b/documents/references.md
@@ -27,6 +27,9 @@ Various references used in project.
 ### Dictionaries
 <https://stackoverflow.com/questions/1494178/how-to-define-hash-tables-in-bash>
 
+### Bash UnitTesting
+<https://github.com/bats-core/bats-core>
+
 
 ## References
 
@@ -66,3 +69,6 @@ Various references used in project.
 
 #### Get User Input
 <https://ryanstutorials.net/bash-scripting-tutorial/bash-input.php>
+
+#### Abort on Error
+<https://stackoverflow.com/a/3474556>