Leprozo, Jr., Dave (25 December 2009). "Mapping out Mount Pulag". GMA News Online. Archived from the original on 4 October 2016. Retrieved 4 October 2016.
Leprozo, Jr., Dave (25 December 2009). "Mapping out Mount Pulag". GMA News Online. Archived from the original on 4 October 2016. Retrieved 4 October 2016.