Abis, L. V. (1980). Utilization of solar energy in the Philippines. Philippine Engineering Journal.
Cita Chicago (17th ed.)Abis, Leopoldo V. "Utilization of Solar Energy in the Philippines." Philippine Engineering Journal 1980.
Cita MLA (9th ed.)Abis, Leopoldo V. "Utilization of Solar Energy in the Philippines." Philippine Engineering Journal, 1980.
Atenció: Aquestes cites poden no estar 100% correctes.