US EPA (2014) Green Gas Emission from Typical Passenger Vehicle.
 Ramos, F.V. (1991) Executive Order 318, s. 1991. Making Philippines Industrializing Country (NIC-Hood Philippines), Manila.
 Annual Report (1993) Secretary of the Department of Education, Manila.
 Encyclopedia Britannica. 15th Edition.
 Compton’s Encyclopedia. 1995 Edition.
 (2008) Tire Vulcanizer. Hirotek Inc., Japan.
 (2010) Tire Vulcanizer. Hirata Corporation, Japan.
 Ramis, E.Z. (2002) Determinants of Professionalism of Graduate School Students, Faculty and Administrator in State Universities and Colleges in Region VIII. Technological University of the Philippines, Manila.