Penyediaan Rancangan Malaysia Keempat (1981-85), MYUPM-UNIPERMA-13-326, Container: Gedung 1/49. MAIN ARCHIVES.
Penyediaan Rancangan Malaysia Keempat (1981-85), MYUPM-UNIPERMA-13-326, Container: Gedung 1/49. MAIN ARCHIVES. http://putraarchives.upm.edu.my:8081/repositories/2/resources/851 Accessed March 15, 2025.