(1975). Philippine inventions. volume1: A catalogue of inventions, utility models and creative researches (Trial edition.). Human Settlements Program Development Academy of the Philippines.
Cita Chicago (17th ed.)Philippine Inventions. Volume1: A Catalogue of Inventions, Utility Models and Creative Researches. Trial edition. Quexon City: Human Settlements Program Development Academy of the Philippines, 1975.
Cita MLA (9th ed.)Philippine Inventions. Volume1: A Catalogue of Inventions, Utility Models and Creative Researches. Trial edition. Human Settlements Program Development Academy of the Philippines, 1975.
Atenció: Aquestes cites poden no estar 100% correctes.