untuk ulangan kimia besok :
dari bu yuni :
http://themasterpieceofscience.blogspot.com/2009/05/chemistry-narkotika.html
http://www.4shared.com/file/146705593/40df6701/kls_8-bab_3-zat_aditif.html
by me http://www.4shared.com/file/146705588/ce168fc8/Zat_Aditif_dan_Adiktif_by_Ryan.html