Suma'mur P.K.; (1986). "Health-based occupational exposure limits (HBOELs) of lead and the operational occupational exposure limits (OOELs)". Higiene Perusahaan, Kesehatan dan Keselamatan Kerja, Vol.XIX, No.2&3, 1986 hal.56-69
Warning: These citations may not always be 100% accurate.