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"HALPETH M.K, . (2004). LIGHT RIGHT A PRACTICING ENGINEER'S MANUAL ON ENERGY EFFICIENT LIGHTING. NEW DELHI: TERI PRESS.
"HALPETH M.K, . 2004. LIGHT RIGHT A PRACTICING ENGINEER'S MANUAL ON ENERGY EFFICIENT LIGHTING. NEW DELHI: TERI PRESS.
"HALPETH M.K, . LIGHT RIGHT A PRACTICING ENGINEER'S MANUAL ON ENERGY EFFICIENT LIGHTING. NEW DELHI: TERI PRESS. 2004.