CEI. (1991). GUIDELINES ON ELECTRICAL ENERGY CONSERVATION. C E I.
Chicago-čujuhus (17. p.)CEI. GUIDELINES ON ELECTRICAL ENERGY CONSERVATION. C E I, 1991.
MLA-čujuhus (9. p.)CEI. GUIDELINES ON ELECTRICAL ENERGY CONSERVATION. C E I, 1991.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.