TY - BOOK AU - Yeap,Tok Kheng TI - Science T2 - Longman reference text series SN - 9789833541249 ; 9833541240 U1 - 507 23 PY - 2007/// CY - Petaling Jaya, Selangor : PB - Pearson Malaysia , KW - Science - Study and teaching N1 - Form 3 ER -