Lawatan Dr. David S. Strong, MYUPM-UNIPERMA-11-423, Container: Gedung 1/F11. MAIN ARCHIVES.
Lawatan Dr. David S. Strong, MYUPM-UNIPERMA-11-423, Container: Gedung 1/F11. MAIN ARCHIVES. http://putraarchives.upm.edu.my:8081/repositories/2/resources/3000 Accessed September 26, 2025.