CEI. (1991). GUIDELINES ON ELECTRICAL ENERGY CONSERVATION. C E I.
Cita Chicago Style (17a ed.)CEI. GUIDELINES ON ELECTRICAL ENERGY CONSERVATION. C E I, 1991.
Cita MLA (9a ed.)CEI. GUIDELINES ON ELECTRICAL ENERGY CONSERVATION. C E I, 1991.
Precaución: Estas citas no son 100% exactas.