Syed Dawilah El-Edrus, Hussain Othman, and Ahmad Esa, Tun Abdullah Hj. Ahmad Badawi : Bapa Pembangunan Modal Insan Negara. Penerbit UTHM, 2010. Accessed: Aug. 27, 2026. [Online]. Available: https://monograph.uthm.edu.my/index.php/penerbituthm/catalog/book/282