Orig, T. S. (2001). Wind-powered water pumping system bared. Manila Bulletin.
Cita Chicago Style (17a ed.)Orig, Thor S. "Wind-powered Water Pumping System Bared." Manila Bulletin 2001.
Cita MLA (9a ed.)Orig, Thor S. "Wind-powered Water Pumping System Bared." Manila Bulletin, 2001.
Precaución: Estas citas no son 100% exactas.