diff --git a/tekkom-ti/index.php b/tekkom-ti/index.php
index 0511338..b1395b8 100644
--- a/tekkom-ti/index.php
+++ b/tekkom-ti/index.php
@@ -64,6 +64,8 @@ include "../includes/courses.php";
- Understanding Computer Today & Tomorrow (Deborah Morley, Charles S. Parker)
+ - Computing Essentials 2023, 29th edition (Timothy O’Leary, Linda O’Leary, Daniel O’Leary)
+ - Computer Science: An Overview 13th Edition (J. Glenn Brookshear, & Brookshear, J. G)