SYED DAWILAH EL-EDRUS; HUSSAIN OTHMAN; AHMAD ESA. Tun Abdullah Hj. Ahmad Badawi : Bapa Pembangunan Modal Insan Negara. [s.l.] : Penerbit UTHM,2010. Disponível em: https://monograph.uthm.edu.my/index.php/penerbituthm/catalog/book/282. Acesso em: 27 aug. 2026.